Answers
The mistake is in the second step, and the correct option is the second one (counting from the top).
The solution of the system is (2, 1).
Where is the mistake in the solution?
Here someone wants to solve the system of equations below:
2x + y = 5
3x - 2y = 4
On the first step, they isolate y on the first equation to get:
y = -2x + 5
Then they substitute that on the same equation, they get:
2x + (-2x + 5) = 5
5 = 5
That is trivial, we are replacing one equation into itself.
The substitution method needs to replace that on the other equation, so there is the mistake, then the correct option is the second.
The actual solution is given by:
3x - 2*(-2x + 5) = 4
3x + 4x - 10 = 4
7x = 4 + 10
x = 14/7 = 2
and the y-value is:
y = -2x + 5
y = -2*2 + 5 = 1
The solution is (2, 1).
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Related Questions
Mr. Autin who work in an office in the city, pend 2/5of hi alary on food and
end 2/3 of the remaining amount to hi wife. (i) What fraction of hi alary remain after he ha pent for hi food?
(ii) What fraction of hi alary doe he end hi wife?
(iii) What fraction of hi alary i left over after thee expene are met?
Answers
Fraction amount left 21/50
What is fraction?A fraction is a part of a whole. In arithmetic, the number is expressed as a quotient, in which the numerator is divided by the denominator. In a simple fraction, both are integers. A complex fraction has a fraction in the numerator or denominator. In a proper fraction, the numerator is less than the denominatorIn Maths, there are three major types of fractions. They are proper fractions, improper fractions and mixed fractions. Fractions are those terms which have numerator and denominator. Based on these two terms we define its types.In Maths, a fraction is used to represent the portion/part of the whole thing. It represents the equal parts of the whole. A fraction has two parts, namely numerator and denominator. The number on the top is called the numerator, and the number on the bottom is called the denominator.
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How much is 37.7 C in F?
Answers
37.7 °Celsius = 99.8 °Fahrenheit. Your normal body temperature is approximately 37°C. A fever is usually when your body temperature is 37.8°C or higher.
Define Fahrenheit?Fahrenheit is a temperature scale on which water freezes at 32 degrees and boils at 212 degrees. It is represented by the symbol ° F. By mid-morning, the temperature had risen above 100 degrees Fahrenheit. Fahrenheit is also a noun.The conversion formulas we use are the same ones found in most textbooks. To convert temperatures from Fahrenheit to Celsius, subtract 32 and multiply by.5556 (or 5/9). To convert degrees Celsius to Fahrenheit, multiply by 1.8 (or 9/5) and add 32.Different systems were developed as a result of different scientists' tools, backgrounds, and goals. The Celsius scale is named after Swedish astronomer Anders Celsius, who invented it in 1742.To learn more about Fahrenheit refer to:
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How many more unit tiles need to be added to the expression x2+4x+3 in order to form a perfect square trinomial? 1 2 3 4.
Answers
The unit tiles that needs to be added to the equation x²+4x+3 will be 1. The correct answer is A.
A square number, also known as a perfect square, is an integer that is the square of another integer. It results from dividing two integers by two.
When converting an expression to a perfect square trinomial
x²+4x+3
We must rearrange the statement in order to transform it into the perfect square.
x²+(2x+2x)+3
Extend the formula (x+2)²
(x+2)² = x² + 2(2x) + 2(2) (2)
(x+2)² = x² + 4 + 4x
(x+2)² = x² + 4x + 4
Add the constant terms together, then subtract them.
Difference is 4 minus 3.
Difference = 1
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This figure is made up of two rectangular prisms. What is the volume of the figure? Enter your answer in the box. ft³ Three-dimensional figure that could be formed by placing a smaller rectangular prism on top of a larger rectangular prism such that the widths of the prisms are the same. The larger bottom prism has a length of 19 feet, a width of 12 feet, and a height of 6 feet. The smaller top prism has a length of 10 feet and a height of 3 feet.
Answers
The required volume of the given figure made up of two rectangular prisms is 1728 cubic feet.
What is the volume of a rectangular prism?The volume of the rectangular prism is the product of the base area and the height.
The volume of the larger rectangular prism is 19 feet x 12 feet x 6 feet = 1368 cubic feet.
The volume of the smaller rectangular prism is 10 feet x 12 feet x 3 feet = 360 cubic feet.
Overall volume of rectangular prisms = 1368 cubic feet + 360 cubic feet
Overall volume of rectangular prisms = 1728 cubic feet
Therefore, the volume of the figure made up of two rectangular prisms is 1728 cubic feet.
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What is a congruent tile?
Answers
If a rigid motion of the plane—that is, a combination of rotations, translations, and reflections—can turn one tile into the other while without stretching or contracting, then two tiles are said to be congruent.
What is congruent ?
Congruent refers to having a precise match in size and shape. Even after the forms have been flipped, turned, or rotated, the shape and size ought to remain constant.
We are surrounded by tiling. Human nature makes us curious about how various small bits fit together when presented.
In the broadest sense, tiling simply refers to the process of breaking up a large area into several little parts (tiles) that seamlessly interlock one another.
Even human bodies, for instance, can be thought of as tilings with cells serving as the "tiles." The earth's surface is tiled by land ownership! There are tiles almost everywhere.
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Find the indicated measure.
Answers
Answer:
∠ C = 40° , x = y = 118
Step-by-step explanation:
10
BC is the diameter of the circle then ∠ A = 90° , angle in a semicircle.
the sum of the 3 angles in Δ ABC = 180° , then
∠ A + ∠ B + ∠ C = 180°
90° + 50° + ∠ C = 180°
140° + ∠ C = 180° ( subtract 140° from both sides )
∠ C = 40°
11
ABCD is a cyclic quadrilateral
• the opposite angles are supplementary, sum to 180°
x + 62 = 180 ( subtract 62 from both sides )
x = 118
similarly
y + 62 = 180
y = 118
thus x = y = 118
Find the general solution of the system of equations Ax=b whose augmented matrix is given below and write it in parametric form. [b] Show the augmented matrix precisely after the first column has been "swept" to have only a "1" in the first row and 0 below- but no other operations have been performed. [c] Show the reduced echelon form [A b]= [ -3, 1, -1, 2, -9, -26, -20] [ 15, -5, 5, -10, 45, 130, [ -30, 10, -8, -62, 12, 32, -178] [ 9, -3, 3, -6, 27, 78, 60] 100] [d] Find 2 linearly independent solutions of the homogeneous system Ax=0 [e] Find a 3rd linearly independent solution of Ax=0 or give a valid reason why you could not find one. [f] Show that v=[ 1] is NOT in the span of the columns of A? [-5] i.e., give a valid proof or reason [10] [-4] [g] Do the first 4 columns of A span State a reason. [h] Give a linearly dependency relation for the first 5 columns of A R"?
Answers
[1, 0, 0, 0] [1] + [0, 1, 0, 0] the span of the columns of A and the general solution of the system of equations Ax = [ 9, -3, 3, -6, 27, 78, 60].
What do you mean by equation?An equation is a mathematical statement that shows the equality of two expressions. It is represented by an equal sign (=) and is used to solve for unknown values or to describe relationships between variables. Equations can be simple or complex, involving basic arithmetic operations or advanced mathematical concepts like trigonometry and calculus. They can also involve constants, variables, functions, and symbols.
An equation can be used to solve for a single unknown value, for example, the equation 2x + 3 = 7 can be solved for x by subtracting 3 from both sides, giving us 2x = 4 and then dividing both sides by 2, giving us x = 2. In this example, x = 2 is the solution to the equation.
[a] The general solution of the system of equations Ax=b can be found by using Gaussian elimination or row reduction. The augmented matrix [A b] is:
[-3, 1, -1, 2, -9, -26, -20]
[15, -5, 5, -10, 45, 130, 100]
[-30, 10, -8, -62, 12, 32, -178]
[ 9, -3, 3, -6, 27, 78, 60]
[b] The first step in row reduction is to get a 1 in the first row and 0s below it in the first column. We can do this by dividing the first row by -3 and subtracting multiples of it from the other rows:
[1, -1/3, 1/3, 2/3, 3, 26/3, 20/3]
[0, 20/3, 4/3, 8/3, 12, 104/3, 140/3]
[0, -40/3, 20/3, 4, -24, 68/3, 140/3]
[0, 3, -3, 0, 9, -78/3, 180/3]
Next, we can use row operations to get 0s in the second column below the first row:
[1, -1/3, 1/3, 2/3, 3, 26/3, 20/3]
[0, 1, 2/5, 4/5, 6, 42/5, 70/5]
[0, 0, 2/5, 2, -18, 26/5, 110/5]
[0, 0, 0, 0, 3, -78/5, 180/5]
Continuing with this process, we get the reduced echelon form of the augmented matrix:
[1, 0, 0, 0, 3, -26/5, 20/5]
[0, 1, 0, 0, 6, 42/5, 70/5]
[0, 0, 1, 0, -18, 26/5, 110/5]
[0, 0, 0, 1, 3, -78/5, 180/5]
[c] The reduced echelon form of [A b] is:
[1, 0, 0, 0, 3, -26/5, 20/5]
[0, 1, 0, 0, 6, 42/5, 70/5]
[0, 0, 1, 0, -18, 26/5, 110/5]
[0, 0, 0, 1, 3, -78/5, 180/5]
[d] The homogeneous system Ax=0 has the general solution:
x1 = t
x2 = 6t
x3 = -18t
x4 = 3t
where t is an arbitrary constant. These are two linearly independent solutions of the homogeneous system.
[e] Since the rank of A is 4, there are no more linearly independent solutions of the homogeneous system Ax=0.
[f] To show that v = [1, -5, 10, -4] is not in the span of the columns of A, we can check if it satisfies the homogeneous system Ax=0. Plugging in the values, we have:
[1, 0, 0, 0] [1] + [0, 1, 0, 0]
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The general solution of the system of equations Ax=b is [ 9, -3, 3, -6, 27, 78, 60], the augmented matrix precisely after the first column has been "swept" is [0, 0, 0, 1, 3, -78/5, 180/5], the reduced echelon form is [0, 0, 0, 1, 3, -78/5, 180/5], the rank of A is 4, there are no more linearly independent solutions of the homogeneous system Ax=0.
What do you mean by equation?An equation is a mathematical statement that shows the equality of two expressions. It is represented by an equal sign (=) and is used to solve for unknown values or to describe relationships between variables. Equations can be simple or complex, involving basic arithmetic operations or advanced mathematical concepts like trigonometry and calculus. They can also involve constants, variables, functions, and symbols.
An equation can be used to solve for a single unknown value, for example, the equation 2x + 3 = 7 can be solved for x by subtracting 3 from both sides, giving us 2x = 4 and then dividing both sides by 2, giving us x = 2. In this example, x = 2 is the solution to the equation.
[a] The general solution of the system of equations Ax=b can be found by using Gaussian elimination or row reduction. The augmented matrix [A b] is:
[-3, 1, -1, 2, -9, -26, -20]
[15, -5, 5, -10, 45, 130, 100]
[-30, 10, -8, -62, 12, 32, -178]
[ 9, -3, 3, -6, 27, 78, 60]
[b] The first step in row reduction is to get a 1 in the first row and 0s below it in the first column. We can do this by dividing the first row by -3 and subtracting multiples of it from the other rows:
[1, -1/3, 1/3, 2/3, 3, 26/3, 20/3]
[0, 20/3, 4/3, 8/3, 12, 104/3, 140/3]
[0, -40/3, 20/3, 4, -24, 68/3, 140/3]
[0, 3, -3, 0, 9, -78/3, 180/3]
Next, we can use row operations to get 0s in the second column below the first row:
[1, -1/3, 1/3, 2/3, 3, 26/3, 20/3]
[0, 1, 2/5, 4/5, 6, 42/5, 70/5]
[0, 0, 2/5, 2, -18, 26/5, 110/5]
[0, 0, 0, 0, 3, -78/5, 180/5]
Continuing with this process, we get the reduced echelon form of the augmented matrix:
[1, 0, 0, 0, 3, -26/5, 20/5]
[0, 1, 0, 0, 6, 42/5, 70/5]
[0, 0, 1, 0, -18, 26/5, 110/5]
[0, 0, 0, 1, 3, -78/5, 180/5]
[c] The reduced echelon form of [A b] is:
[1, 0, 0, 0, 3, -26/5, 20/5]
[0, 1, 0, 0, 6, 42/5, 70/5]
[0, 0, 1, 0, -18, 26/5, 110/5]
[0, 0, 0, 1, 3, -78/5, 180/5]
[d] The homogeneous system Ax=0 has the general solution:
x1 = t
x2 = 6t
x3 = -18t
x4 = 3t
where t is an arbitrary constant. These are two linearly independent solutions of the homogeneous system.
[e] Since the rank of A is 4, there are no more linearly independent solutions of the homogeneous system Ax=0.
[f] To show that v = [1, -5, 10, -4] is not in the span of the columns of A, we can check if it satisfies the homogeneous system Ax=0. Plugging in the values, we have:
[1, 0, 0, 0] [1] + [0, 1, 0, 0]
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Allison has a loyalty card good for a discount at her local hardware store. The item she wants to buy is priced at $36, before discount and tax. After the discount, and before tax, the price is $30. 96. Find the percent discount
Answers
the percent discount is 14% when the original price and new price are given $36 and $30.96.
Given that,
Original price of item = $36 (that is before discount and the tax)
Price after discount = $30.96
Let the percentage discount be = x
A discount is the reduction of either the monetary amount or a percentage of the normal selling price of a product or service.
To get the percent discount :
x = (original cost - new price)/original price
x = (36 - 30.96)/36
x = 5.06/36
x = 0.14
Percentage discount x , in percentage = 0.14 x 100
Percentage discount = 14%
therefore, the percent discount is 14%
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Simplify the expression by combining like
terms:
b+3b²+ b-b²
Enter the number that goes in the green box.
[?]b² + [ ]b
Enter
Answers
We can simplify the expression to get:
2*(b + b²)
How to simplify the expression?Here we want to simplify the following expression:
b + 3b² + b - b²
We can reorder that expression in the following way.
b + b + 3b² - b²
And now group like terms, we will get:
b + b + 3b² - b²
2b + (3 - 1)* b²
2b + 2b²
Now we can take 2 as a common factor to get:
2*(b + b²)
That is the expresion simplfied.
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cual es el mayor numero de cuatro cifras que se puede formar de esta manera
1720
Answers
The largest digit number that can be formed from 1720 is 7210
What are integers?An integer is the number zero, a positive natural number or a negative integer with a minus sign. The negative numbers are the additive inverses of the corresponding positive numbers.
Examples of integers include -2, 567, -1000, 0, e.t.c
Numbers that can be formed from 1720 are:
1270,
1072,
1027
1207
7201
7102
7210
Among all the numbers , 7210 is the highest number that can be formed from 1720
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Divide 16 by v. Then, subtract 7
Answers
Answer:
Step-by-step explanation:
The order of operations is a rule that tells the correct sequence of steps for evaluating a math expression. We can remember the order using PEMDAS: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).
2( T + 1) = 10
thank u
T=
Answers
You divide both sides by 2, getting you with T+1=5.
5-1=4
Therefore, T=4
Answer: T=4
Step-by-step explanation:
Good evening.
The first thing you want to do is distribute the 2.
[tex]2t+2=10[/tex]
Then, we need to subtract the 2 on both sides.
[tex]2t=8[/tex]
Then we divide both sides by 2, giving us the ultimate answer of T=4.
[tex]t=4[/tex]
For the function shown below, the definite integral integral_0^10 f(x) dx is closest to which of the following? a.-8 b.4 c.-4 d.0 e.8
Answers
The provided function's definite integral from 0 to 10 is closest to 4.
The area of each zone that the function, the x-axis, and the two vertical lines at x = 0 and x = 10 bounds is added to form the definite integral of the function. The definite integral that results from adding up each of these areas is the one that is closest to 4. The area of the region above the x-axis is larger than the area of the region below the x-axis, which explains this. The area of the region above the x-axis is higher than the area below the x-axis because the function is rising across the interval. The overall area is closer to 4 since the area of the region below the x-axis is negative. As a result, 4 is the closest value for the definite integral of the 0–10 function.
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The graph of y = tan x is concave up on which of the following intervals?A. (0,π/2)B. (-π/2,0)C. (-π/4, π/4) D. (0,π)E.(-π,0)
Answers
The graph of y = tan x is concave up on the interval (0,π/2).
The graph of y = tan x is concave up on the interval (0,π/2). This can be shown by studying the second derivative of the tangent function. The second derivative of the tangent function is d2y/dx2 = 2sec2(x)(tan(x)) > 0, which means that the tangent function is concave up for all values of x. This implies that the graph of y = tan x is concave up on the interval (0,π/2). To show this, we can take a few points on the interval (0,π/2) and calculate the values of the second derivative of tan x at those points. For example, for x = π/4, the second derivative of tan x is 2sec2(π/4)(tan(π/4)) = 2(1.1547)(1.7321) = 4.9289 which is positive. This shows that the graph of y = tan x is concave up on the interval (0,π/2).
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How do I solve this to find the points?
Answers
Answer:
Step-by-step explanation:
4x+5y=15
-4x. -4x
5y=-4x+15
divide by 5 on both sides
y = 4/5x+3
Two points would be : (0,3) & (7,5)
extra : 4/5 means on the graph you go up 4 spaces, and to the right 5 spaces, in reverse you would go down 4 spaces and 5 spaces to the left
hope this helped =)
-YinAhara
Hanz and Franz are in a shooting competition. The object of the match is to be the first to hit the bull's eye of a target 100 feet away. The two opponents alternate turns shooting, and each opponent has a 40% chance of hitting the bull's-eye on a given shot. If Hans graciously allows Franz to shoot first, what is the probability that Hans will win the competition and take no more than three shots? HELP FAST
Answers
The probability of Hans winning the competition and taking no more than three shots is 0.784.
How to find the possibility?To calculate the probability that Hans wins after taking no more than 3 shots, we can use the cumulative distribution function (CDF) of the binomial distribution.
The CDF gives the probability of getting k or fewer successful shots in n trials, with a success probability of p.
In this case, n = 3, p = 0.4, and k = 2 (since Hans wins if he hits the bull's-eye with 2 shots or fewer).
Using the cumulative binomial distribution formula, the probability of Hans winning the competition and taking no more than three shots is 0.784.
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13 less than b In algebraic expression
Answers
13 less than b as an algebraic expression would be [tex]b - 13[/tex].
This is because 13 less than a number is the same as that number being subtracted by 13. Let me know if you have any questions, thanks!
Identify the reflection rule on a coordinate plane that verifies that triangle a(-2,3), b(-3,-2), c(-10,0) and triangle a'(2,3), b'(3,-2), c'(10,0) are congruent when reflected over the y-axis.
Answers
The triangles are not congruent. Three edges and three vertices make up a triangle, which is a polygon. It is among the fundamental shapes in geometry. Triangle ABC refers to a triangle with the vertices A, B, and C.
What is meant by congruent?In geometry, two figures or objects are congruent if they have the same shape and size, or if one is the mirror image of the other. If two shapes are similar in size and shape, they are said to be congruent. Additionally, if two shapes are congruent, then their mirror images are same.comparable to or in accord with something so that the two things can coexist or be joined without conflict: There is no conflict because our objectives are compatible. Congruent means "absolutely equal" in terms of size and shape. The forms hold their equality no matter how they are rotated, flipped, or turned.To learn more about congruent refer to:
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A mass of 6.005 g of carbon contains
Answers
The 6.005 g of carbon contains 0.5000 moles of C. option C
What is the mole?The mole is a unit of measurement in chemistry used to quantify the amount of a substance. One mole of a substance contains Avogadro's number of entities of that substance. Avogadro's number is defined as 6.022 x 10^23 entities per mole and is a fundamental constant in chemistry.
The mole is used to convert the amount of a substance in mass or volume to the number of entities (such as atoms, molecules, or ions) of that substance. The mole is useful in chemical reactions, where it provides a convenient way to express the amounts of reactants and products involved in a reaction.
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he amygdala is a brain structure involved in the processing and memory of emotional reactions.
In a research project, subjects were shown emotional video clips. Then they had their brains scanned with position emission tomography (PET), and their memory of the clips was assessed quantitatively.
The data will be used to investigate whether there is an association between relatively amygdala activity and memory score.
What would the test statistic be, the null hypothesis, and the type of test.
Answers
The test statistic be Pearson's correlation test.
What is Null hypothesis ?
The null hypothesis assumes that any difference between the selected attributes in a set of data is attributable to chance.
The test statistic could be Pearson's correlation coefficient, which measures the linear association between two continuous variables (here, amygdala activity and memory score).
The null hypothesis would be that there is no association between amygdala activity and memory score, which can be represented as:
H0: r = 0
The type of test would be a Pearson's correlation test, which is a parametric test that assesses the strength and direction of the linear relationship between two continuous variables.
Hence, The test statistic be Pearson's correlation test.
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Consider the initial value problem y' = 3y^2, y(0) = y0. What value(s) of y0| will the solution have a vertical asymptote at t = 2 and a thinterval of existence - [infinity]
Answers
Consider the initial value problem y' = 3y^2, at the value of y(0) = 1/6 will the solution have a vertical asymptote at t = 2.
The differential equation is y'=3y^2.
We can write this equation as:
dy/dt = 3y^2
dy/y^2 = 3dt
Now integrating on both side
[tex]\int \frac{dy}{y^2} = \int 3dt[/tex]
After integrating we get,
- 1/y = 3t + c
Multiply by y on both side, we get
(3t + c)y = -1
Divide by (3t + c) on both side, we get
y = -1/(3t + c).................(1)
Since there is vertical asymptote at t = 2
So 3t + c = 0 at t = 2
3(2) + c = 0
6 + c = 0
Subtract 6 on both side, we get
c = -6
Put the value of c in equation 1
y = -1/(3t - 6)
At t = 0
y(0) = -1/(3(0) - 6)
y(0) = 1/6
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Someone help I need this because I’m kinda failing math
Answers
The value function for g(7), g(0) and g(-5) are 14, 7 and 2 respectively.
What is the function?Functions are the fundamental part of the calculus in mathematics. The functions are the special types of relations. A function in math is visualized as a rule, which gives a unique output for every input x.
From the graph, we have y-intercept (0, 7) and slope (m)=3/3 =1
Here, y=x+7
g(x)=x+7
g(7)=7+7
g(7)=14
g(0)=0+7
g(0)=7
g(-5)=-5+7
g(-5)=2
g(x)=3
So, x+7=3
x=-4
Therefore, the value function for g(7), g(0) and g(-5) are 14, 7 and 2 respectively.
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A group of students was surveyed in a middle school class. They were asked how many hours they work on math homework each week. The results from the survey were recorded.
Number of Hours Total Number of Students
0 1
1 8
2 2
3 5
4 9
5 7
6 3
Determine the probability that a student studied for exactly 1 hour. Round to the nearest hundredth.
0.03
0.23
0.30
0.77
Answers
The probability that a student studied for 5 hours is 0.23.
What is the probability?Probability refers to the likelihood or chance that an expected success is observed over many possible observations, outcomes, or events.
Probability can be expressed as a percentage, decimal, or fraction.
here, we have,
In this situation, the probability that a student studied for 5 hours is the quotient of the division of the number of students who studied for 5 hours and the total number of students who studied.
Number of hours Total number
of students
0 1
1 3
2 2
3 5
4 9
5 7
6 3
Total 30
Probability a student studied 5 hours = 0.23 (7/30)
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help me please and thank you!!!
Answers
hope this helps :)
Explain what each point on the least-squares regression line represents.
Choose the correct answer below.
A.Each point on the least-squares regression line represents the y-value of the data set at that corresponding value of x.
B.Each point on the least-squares regression line represents the y-values that would be considered ideal at that corresponding value of x.
C.Each point on the least-squares regression line represents the predicted y-value at the corresponding value of x.
D.Each point on the least-squares regression line represents one of the points in the data set.
Answers
The correct statement is "Each point on the least-squares regression line represents the predicted y-value at the corresponding value of x". Thus, Option C is correct.
A least-squares regression line is a mathematical model that is used to predict the value of a dependent variable (y) based on the value of an independent variable (x). The regression line is created by fitting a line to the data set that minimizes the differences between the actual y-values and the predicted y-values (the line).
Each point on the regression line represents the predicted y-value for a given value of x. In other words, if we know the value of x, we can use the regression line to predict the value of y that is most likely to occur based on the data set. The least-squares regression line is a useful tool for understanding the relationship between two variables and making predictions about future values.
A is incorrect because it states that each point on the least-squares regression line represents the actual y-value of the data set at that corresponding value of x, which is not necessarily the case. The regression line is a model that predicts y-values based on the relationship between x and y, but it is not necessarily equal to the actual y-values in the data set.
B is incorrect because it states that each point on the least-squares regression line represents the ideal y-values at that corresponding value of x, which is not a characteristic of a regression line. A regression line represents a predicted y-value based on the data set and the relationship between x and y, but it does not necessarily represent ideal values.
D is incorrect because it states that each point on the least-squares regression line represents one of the points in the data set, which is not necessarily the case. A regression line represents a predicted y-value based on the data set and the relationship between x and y, and it may not necessarily match the actual data points in the data set.
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Find the slope of the tangent line to the given polar curve at the point specified by the value of theta.
r = 6 cos(theta),
theta = ????/3
*its not negative square root of 3
Answers
The slope of the line would be theta = cos⁻¹ (r/6)
The Slope is what?In mathematics, a line's slope, also known as its gradient, is a numerical representation of the line's steepness and direction.
By taking the derivative of the polar equation with respect to theta and evaluating it at the provided value of theta, one can determine the slope of the tangent line to the polar curve at the indicated position.
The rise divided by the run formula is used to calculate the percent of slope, which is calculated by multiplying the result by 100 and dividing the elevation change by the horizontal distance travelled.
d(r)/d(theta) = -6 sin(theta)
So, for theta = ????/3, the slope of the tangent line is:
-6 sin(????/3)
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A student randomly draws a card from a standard deck of 52 cards. He records the type of card drawn and places it back in the deck. This is repeated 20 times. The table below shows the frequency of each outcome.
Outcome Frequency
Heart 7
Spade 3
Club 6
Diamond 4
Determine the experimental probability of drawing a spade.
0.15
0.25
0.35
0.50
Answers
The experimental probability of drawing a spade is 0.15.
What is probability?The probability that an event will occur is equal to the ratio of positive outcomes to all outcomes, according to the probability formula. The proportion of positive outcomes to overall outcomes, or P(E), determines the likelihood that an event will occur.
Given A student randomly draws a card from a standard deck of 52 cards, this is repeated 20 times.
total outcome = 20
The table below shows the frequency of each outcome.
Outcome Frequency
Heart 7
Spade 3
Club 6
Diamond 4
to find the probability of drawing a spade,
a favorable outcome for spade = 3
probability = favorable outcome/total outcome
P(spade) = 3/20
P(spade) = 0.15
Hence option A is correct.
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Answer:
Step-by-step explanation: .15 because there are 20 in total, and there are 3 spade.
3/20=.15
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Now examine the lower panel (butterflies), where the curve continues to rise linearly. What does this indicate about the brocesses structuring the butterfly community? It suggests that the communities are unsaturated and that the size of the regional pool determines local species richness. It suggests that the communities are becoming saturated and that local processes are likely becoming increasingly important. It does not tell us anything about the relative importance of the regional species pool and local interactions.
Answers
It suggests that the communities are unsaturated and that the size of the regional pool determines local species richness.
The correct option is (A)
Now, According to the question:
This suggests that the processes structuring the butterfly community are likely related to the presence and abundance of resources such as food plants and suitable habitat for the butterflies. As the number of individuals in the community increases, the number of different species that can be supported also increases, resulting in a linear relationship between the two. Additionally, this indicates that the butterfly community is likely experiencing a relatively stable and predictable environment, where resources are available to support a diverse population of butterflies.
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The complete question in the form is:
Now examine the lower panel (butterflies), where the curve continues to rise linearly. What does this indicate about the processes structuring the butterfly community?
(A) It suggests that the communities are unsaturated and that the size of the regional pool determines local species richness.
(B) It suggests that the communities are becoming saturated and that local processes are likely becoming increasingly important.
(C) It does not tell us anything about the relative importance of the regional species pool and local interactions.
The triangles below are similar. Find the value of the variable.
Answers
The measure of the variable z is 44.
What is Similarity of Triangles?Two triangles are said to be comparable if their two sides are in the same ratio as the two sides of another triangle and their two sides' angles inscribed in both triangles are equal.
Given:
As, the Triangles are similar.
and, we know that similar triangles have their ratio of the corresponding sides equal.
Then, z/ 45 = 44/ 45
45z = 44 x 45
z = 44
Hence, the measure of z is 44.
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the quadrilateral EFGH has vertices E (-3,2) F(3,2), G(3,-2), and H(-3,-2) which statement is correct
Answers
The statement that is correct on Quadrilateral EFGH is B. Quadrilateral EFGH is a rectangle.
What kind of shape is Quadrilateral EFGH ?To find out the type of shape that Quadrilateral EFGH is, you need to find the dimensions of the sides of the shape.
This can be found by the formula :
d=√(( x2 – x1 ) ² + ( y2 – y1 ) ² )
Using the formula, Side EF is 6 units
Side FG = 4 units
Side GH = 6 units
Side EH = 4 units
Two sides are therefore the same which means that this is a rectangle.
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Options for this question include:
A. Quadrilateral EFGH is a square.
B. Quadnlateral EFGH is a rectangle.
C. Quadrilateral EFGH is a rhombus
D. Quadriateral EFGH is a trapezium.