Answer:
Step-by-step explanation:
He can walk 125km in 2 and a half hours
Answer:
125km
Step-by-step explanation:
If he walks 50km per hour and he walks 2 hours it's 2 x 50km = 100km
if walks for another half hour the half of 50km is 25km so 100km + 25km = 125km
When interpreting the covariance between variables x and y, which of the following statements is the most accurate? - A negative value of covariance indicates that, on average, if x is above its mean, then y tends to be above its mean - A positive value of covariance indicates that, on average, if x is above its mean, then y tends to be below its mean. - A positive value of covariance indicates that, on average, if x is below its mean, then y tends to be below its mean. - A negative value of covariance that, on average, if x is below its mean, then y tends to be below its mean
When the interpreting the covariance between X and Y , a positive value of covariance indicates that , on average ,if x below its mean then y tends to be below its mean.
What is meant by covariance?Covariance is a statistical measure that indicates how two variables are related to each other. Specifically, covariance measures the degree to which the values of two variables vary together. If two variables have a positive covariance, it means that they tend to increase or decrease together. Conversely, if two variables have a negative covariance, it means that they tend to move in opposite directions.
Mathematically, covariance is calculated as the average of the products of the deviations of each value from their respective means, for two variables. A positive covariance indicates that the two variables tend to be above or below their respective means together, while a negative covariance indicates that one variable tends to be above its mean when the other is below its mean, and vice versa.
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The probability of obtaining a head when a certain coin is flipped is about 0. 65. Which of the following is closest to the probability that heads would be obtained 15 or fewer times when this coin is flipped 25 times?O 0.14
O 0.37
O 0.39
O 0.60
O 0.65
The probability that heads would be obtained 15 or fewer times when this coin is flipped 25 times is 0.370
A probability is a number that reflects the chance or likelihood that a particular event will occur. Probabilities can be expressed as proportions that range from 0 to 1, and they can also be expressed as percentages ranging from 0% to 100%.
"Information available from the question"
The parameters are:
Sample size, n = 25
Probability of success, p = 0.65
Number of success, x ≤ 15
The probability is represented using the following binomial formula:
[tex]P(x) =n_C_x*p^x*(1-p)^n^-^x[/tex]
Using the above formula, we have:
P(x ≤ 15) = 0.370
Hence, the probability is 0.370
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What kind of problem is "What number multiplied by the expression of 5 x 10^3 is equivalent to the expression 5 x 10^6?"
The problem is the multiplication with exponent or scientific notation kind of problem.
What is meant by Scientific Notation?Scientific notation is a way of writing a large number or small number with many digits in a simpler form using the power of 10.
For example, 30,000 can be written as 3 × 10⁴.
Here, the problem is defined as multiplying the expression 5 × 10³ with some number to get the expression 5 × 10⁶.
Let x be the number that is multiplied.
(5 × 10³) x = 5 × 10⁶
x = (5 × 10⁶) / (5 × 10³)
x = 10⁶ / 10³
x = 10⁶⁻³ = 10³
So here we are using the scientific notation to solve the whole problem and the answer itself is in the scientific notation.
Hence the given problem is a Multiplication of numbers in scientific notation kind of problem.
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The graph on the right shows the remaining life expectancy, E, in years for females of age x.
Find the average rate of change between the ages of 50 and 60. Describe what the average rate of
change means in this situation.
The average rate of change of life expectancy between the ages of 50 and 60 is
(Type an integer or a decimal.)
The average rate of change of life expectancy between the ages of 50 and 60 will be 0.88.
What is the average rate change?It is the average amount by which the function varied per unit throughout that time period. It is calculated using the gradient of the line linking the interval's ends on the graph depicting the function.
Average rate = [f(x₂) - f(x₁)] / [x₂ - x₁]
The graph on the right shows the remaining life expectancy, E, in years for females of age x.
Then the average rate of change is given as,
Average rate = (32.8 - 24) / (60 - 50)
Average rate = 8.8 / 10
Average rate = 0.88
The average rate of change of life expectancy between the ages of 50 and 60 will be 0.88.
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(a) Determine the ratio of the volume of a (right circular) cone to the volume of a cylinder with the same height and base radius:
First you will need to determine the equation of the line which rotates to generate the cone.)
(a) Ratio of the volume of a right circular cone to the volume of a cylinder with same height and base radius= 1/3
(b)Ratio of the volume of a paraboloid to the volume of a cylinder= 1/2
(c)Ratio of the volume of a sphere and cylinder= 4/6
(a)Let r be the radius and h be the height of the right circular cylinder and right circular cone.
Volume of the right circular cylinder= πr²h
Volume of the right circular cone= 1/3 πr²h
Ratio of volume of a cone to the volume of a cylinder
= 1/3
Therefore, Ratio of the volume of a right circular cone to the volume of a cylinder with same height and base radius= 1/3
(b) Volume of the paraboloid = π/2r²h
Ratio of volume of a paraboloid to the ratio of volume of a cylinder
=1/2 πr²h/ πr²h
= 1/2
Therefore, Ratio of the volume of a paraboloid to the volume of a cylinder= 1/2
(c)Volume of a sphere= 4/3πr³
Given: Height of a cylinder h=2r (the diameter of the sphere)
Volume of a cylinder = 2πr³
Ratio of volume of a sphere to the volume of a cylinder
= 4/3πr³/ 2πr³
= 4/6
Therefore, Ratio of the volume of a sphere and cylinder= 4/6
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Complete question:
(a) Determine the ratio of the volume of a (right circular) cone to the volume of a cylinder with the same height and base radius:
First you will need to determine the equation of the line which rotates to generate the cone.)
b) Determine the ratio of the volume of a paraboloid (a parabola rotated about the y axis) to the volume of a cylinder with the same height and base radius:
(c) Archimedes was particularly pleased when he determined the ratio of the volumes of a sphere and cylinder. Determine the ratio of the volume of a sphere to the volume of a cylinder having the same radius, and having height the same as the diameter of the sphere:
Tyler gets his hair cut at the barber
shop once every 4 weeks. How many
trips will he make to the barber shop
in 2 years? You may use the table to
help, if needed. Note: There are
52 weeks in one year.
Answer:
he would go to the barber shop 21 times in 2 years
Step-by-step explanation:
divide 4 by 52 and then multiply by 2
Answer:
26
Step-by-step explanation:
52÷4 = 13 times a year
therefore, for two years
13 × 2 = 26
The square root of a number will always have two outcomes One is positive and the other is negative.
true or false
The square root of zero is a counterexample of the statement, so it is false.
Is the statement true or false?Here we have the following statement about square roots:
"the square root of a number will always have two outcomes One is positive and the other is negative."
This seems to be true because:
-2*-2 = 2*2 = 4
So √4 = 2 and -2
But, particularly the square root of zero is:
√0 = 0
So here we have only one outcome that is neither positive nor negative, then the statement is false.
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A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 97, and the sample standard deviation, s, is found to be 13. (a) Construct a 90% confidence interval about μ if the sample size, n, is 27. (b) Construct a 90% confidence interval about μ if the sample size, n, is 18. (c) Construct an 80% confidence interval about μ if the sample size, n, is 27. (d) Could we have computed the confidence intervals in parts (a)-(c) if the population had not been normally distributed?
a) 90% confident that the true population mean μ is between 91.01 and 102.99.
b) 90% confident that the true population mean μ is between 92.26 and 101.74.
c) 80% confident that the true population mean μ is between 93.79 and 100.21.
d) Using Central Limit Theorem to approximate the population mean as normally distributed, the confidence intervals can still be computed using the same formula as before.
(a) To construct a 90% confidence interval about μ when n = 27, we use the formula:
x ± z × (s/√n)
where x is the sample mean, s is the sample standard deviation, n is the sample size, and z is the z-score that corresponds to the desired confidence level (in this case, z = 1.645 for a 90% confidence level). Plugging in the values given, we get:
97 ± 1.645 × (13/√27)
which simplifies to:
(91.01, 102.99)
Therefore, we are 90% confident that the true population mean μ is between 91.01 and 102.99.
(b) To construct a 90% confidence interval about μ when n = 18, we use the same formula as before, but with a different z-score (since the sample size is smaller). In this case, we use z = 1.734, and we get:
97 ± 1.734 × (13/√18)
which simplifies to:
(92.26, 101.74)
Therefore, we are 90% confident that the true population mean μ is between 92.26 and 101.74.
(c) To construct an 80% confidence interval about μ when n = 27, we use the same formula as before, but with a different z-score (since the confidence level is different). In this case, we use z = 1.282, and we get:
97 ± 1.282 × (13/√27)
which simplifies to:
(93.79, 100.21)
Therefore, we are 80% confident that the true population mean μ is between 93.79 and 100.21.
(d) The confidence intervals in parts (a)-(c) assume that the population is normally distributed. If the population is not normally distributed, we cannot rely on these intervals to accurately estimate the true population mean. However, if the sample size is sufficiently large (usually n > 30), we can use the Central Limit Theorem to approximate the population mean as normally distributed, and the confidence intervals can still be computed using the same formula as before. If the sample size is small and the population is not normally distributed, other methods may be needed to construct a confidence interval, such as bootstrapping or using a non-parametric approach.
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Which graph represents the equation y = −12 x + 3 ?
Graph 2
It is the graph with the line on the positive Y-Axis as the equation is ended with +3
The sides of a triangle are 44, 73, and 86. Use the Pythagorean Theorem to determine
if the triangle is right, acute, or obtuse.
The triangle is
of the squares of the other two sides.
because the square of the largest side
Submit Answer
the sum
at
The triangle with sides 44, 73, and 86 is an obtuse triangle.
The Pythagorean Theorem states that the square of the length of the hypotenuse (the side opposite the right angle) in a right triangle is equal to the sum of the squares of the lengths of the other two sides, can be used to determine whether the triangle is right, acute, or obtuse.
In an acute triangle, the square of the hypotenuse length is less than the sum of the squares of the other two sides; in an obtuse triangle, the square of the hypotenuse length is greater than the sum of the squares of the other two sides.
Begin by calculating the square of each side:
[tex]44^2 = 1936[/tex]
[tex]73^2 = 5329[/tex]
[tex]86^2 = 7396[/tex]
Let us now see if the triangle fulfils the Pythagorean Theorem:
1936 + 5329 = 7265
We know the triangle is not obtuse because 7265 is less than 7396.
1936 + 7396 = 9332
We know the triangle is not acute because 9332 is greater than 5329.
5329 + 7396 = 12725
We know the triangle is obtuse because 12725 is greater than 7265 but less than 9332.
As a result, the triangle with sides 44, 73, and 86 is obtuse.
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EASY POINTS!
Which is the BEST definition of the term mirror line?
A mirror line is the line over which an object in the coordinate plane is reflected.
A mirror line is a line in the plane that is units away from the y-axis.
A mirror line is another name for the line of translation.
A mirror line is always a diagonal line in the plane that divides it into eight sections.
The best definition of the term mirror line is "A mirror line is the line over which an object in the coordinate plane is reflected". So option A is correct.
What is mirror line ?A form or item is divided into two equal and symmetrical portions by a line of symmetry. Because it divides the figure symmetrically and the separated portions resemble mirror images of one another, we also refer to this line as the axis of symmetry or the mirror line.
Given options,
A. A mirror line is the line over which an object in the coordinate plane is reflected.
Yes this statement is according to definition of mirror line.
B. A mirror line is a line in the plane that is units away from the y-axis.
no its is not like that so it is incorrect option.
C. A mirror line is another name for the line of translation. no translation is a different concept so it also incorrect.
D. A mirror line is always a diagonal line in the plane that divides it into eight sections. it is also not correct.
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1
A red die is tossed and then a green. die is tossed.
What is the probability that the red die shows a
number larger than 4 or the green die shows a
number less than 2?
The two events are not mutually exclusive. So to find the
probability of the union, use:
P(A or B) = P(A) + P(B) - P(A and B)
[?]
P(A or B)
=
8
P(B)
Green die
What is the probability of the red die rolling a
P(A)
Red die
+
-
8)
P(B)
P(A)
Red die Green die
number greater than 4?
Enter your answer in simplest form.
Enter
On solving the provided question, we can say that the probability of the red die rolling is 16.67% probability = 0.1667
What is probability?A branch of mathematics called probability theory determines the chance that an event will occur or that a statement is true. A probability is a number between 0 and 1, where 1 denotes certainty and about 0 denotes how probable an event is to occur. The possibility or likelihood that a specific event will occur is expressed numerically as a probability. Probabilities can also be expressed as percentages from 0% to 100% or as numbers between 0 and 1. the proportion of occurrences among all equally likely alternatives that lead to a certain event relative to all possible outcomes.
red die, there are 3 numbers greater than 3 out of 6 numbers
Probability (A) = 3/6 = 1/2.
green die, there are 2 numbers less than 3 out of 6 numbers
Probability (B) = 2/6 = 1/3.
events are independent
P(A and B) = [tex]P(A)P(B) = 1/2 X 1/3 = 1/6 = 0.1667[/tex][tex]P(A)P(B) = 1/2 X 1/3 = 1/6 = 0.1667.[/tex]
16.67% probability = 0.1667
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Question 4(Multiple Choice Worth 2 points)
(Linear Functions MC)
Which statement best explains whether the data in the following table represents a linear or nonlinear function?
X y
-4 3
-1 1.5
01
4 -1
O The table represents a nonlinear function because the graph does not show a constant rate of change.
The table represents a linear function because the graph shows a constant rate of change.
O The table represents a nonlinear function because the graph shows a rate of change that is decreasing.
O The table represents a linear function because the graph shows a rate of change that is increasing.
Answer: B
Step-by-step explanation: The table represents a linear function because the graph shows a constant rate of change.
Which is the graph of f(x) = square root 4x
The graph of the function is attached
How to determine the graph of the functionFrom the question, we have the following parameters that can be used in our computation:
f(x) = square root 4x
This can be expressed as
f(x) = √(4x)
Take the square root of 4
So, we have the following representation
f(x) = 2√x
This means that the graph f(x) = √(4x) and f(x) = √(4x) are the same
Next, we plot the graph
See attachment for the graph of f(x)
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select the expression that is equivalent to (x + 6)^2 A. x^2 + 12x^2 + 36 B x^2 + 12x + 36 C 2x + 12x + 12 D x^2 + 6x + 36
3x
x equals ur mom so udhdhddhehehrhrhrhrrruur mom is ur mome
How to find the missing variable and /or the side length ?.please help this is geometry
The missing variables of the line transversal using similarity ratio are;
x = 10
MT = 14
UP = 23
How to find the proportion of similar sides?When two parallel lines crossed by a transversal, they formed same-side interior angles and their sum is equal to 180 degrees. As the sum of the same side interior angles is 180 degrees therefore the angles are supplementary.
Now, from the diagram, using the concept of similarity ratio, we can say that;
2/3 = (x + 2)/(x + 8)
Cross multiply to get;
2(x + 8) = 3(x + 2)
2x + 16 = 3x + 6
x = 10
Thus;
MT = (10 + 2) + 2
MT = 14
UP = (12 + 8) + 3
UP = 23
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what is the product of these bionomials? (x - 6)(x + 2) =
Answer:
Step-by-step explanation:
Multiply x*x, then X*2, then -6*2, lastly -6*x. So in other words multiply all of the factors. pay close attention to the + and - negative signs.
Answer: [tex]x^{2}[/tex]+2x-6x+2x
Simplify: [tex]x^{2}[/tex]-4x+2x
The t distribution is similar to the z distribution in all BUT one of the following characteristics. Which one is it? Explain
a. Continuous
b. Symmetrical
c. Bell-shaped
d. t distribution's mean=0 and standard deviation=1
d.) T distribution's mean=0 and standard deviation=1 is not true. Instead, the t distribution has a mean of 0 and a standard deviation that varies based on the sample size and degrees of freedom
The t distribution is not similar to the z distribution in terms of its standard deviation. Unlike the standard normal distribution (z distribution), which has a mean of 0 and a standard deviation of 1, the t distribution has a mean of 0, but its standard deviation varies depending on the sample size. Specifically, the t distribution has heavier tails than the z distribution, which means it has more spread in the distribution and more extreme values are more likely to occur.
The t distribution's mean=0 and standard deviation=1 is not true, hence the proper response is d. The t distribution, on the other hand, has a mean of zero and a standard deviation that varies according to the sample size and degrees of freedom.
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Priyas's cat Wright y
5 and 1/2 pounds and her dog weights 8 and 1/4 pounds
Their combineta weight id pounds
Answer:
13 3/4
Step-by-step explanation:
5+8 = 13
1/2 = 2/4
2/4+1/4 = 3/4
Compute each matrix sum or product if it is defined. If an expression is undefined, explain why. Let A= 3 0 −2 4 −5 2 , B= 8 −4 1 2 −3 −4 , C= 2 3 −3 2 , and D= 2 5 −2 5 .
−2A, B−2A, AC, CD
The solution is,
-2A = (-6, -8, 0, 8, 2, -8)
B - 2A = (2, -7, -4, 3, 4, -12)
AC is undefined.
CD = (3, 2, 12, 5)
What is matrix?In mathematics, a matrix is a rectangular array or table of numbers, symbols, or expressions, arranged in rows and columns, which is used to represent a mathematical object or a property of such an object.
here, we have,
Given the matrices:
A = (3 4 0 -4 -1 4)
B = (8 1 -4 -5 2 -4)
C = (1 -1 3 1)
D = (3 -2 4 5)
We are required to compute the following
-2A, B - 2A, AC, CD
For -2A:
-2(3 4 0 -4 -1 4)
= (-6, -8, 0, 8, 2, -8)
For B - 2A:
Because B - 2A = B + (-2A),
we have:
(8 1 -4 -5 2 -4) + (-6, -8, 0, 8, 2, -8)
(2, -7, -4, 3, 4, -12)
For AC:
(3 4 0 -4 -1 4)(1 -1 3 1)
This is undefined.
For CD:
(1 -1 3 1)(3 -2 4 5)
= (3, 2, 12, 5)
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If 16 out of 20 vegetables are carrots, how many carrots vegetables will there be per 100 vegetables total?
Answer:
80
Step-by-step explanation:
16/20 —> 80/100
or
16/20 = 8/10 = 80%
Which constants could each equation be multiplied by to eliminate the x-variable using addition in this system of
equations?
2x+3y=25
-3x+4y=22
To eliminate the x-variable using addition in this system of equations we must multiply 3(2x + 3y = 25) and 2(- 3x + 4y = 22).
What are the three types of solutions for a system of linear equations?If a system of equations only contains two linear equations with two variables, the system's equation can be graphed, the graph will have two straight lines, and the intersection point(s) of those lines will be the system's solution.
There are only three matching forms of solution for a given system of equations because there are only three different ways that two straight lines in the plane can graph.
Given, A system of equations 2x + 3y = 25 and - 3x + 4y = 22.
Now, To eliminate the x-variable using addition we have to multiply equation (i) by 3 and equation (ii) by 2 which results in,
6x + 9y = 75 and - 6x + 8y = 44, (6x + (-6x) would cancel out).
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find the volume v of the described solid s. a pyramid with height h and base an equilateral triangle with side a (a tetrahedron)
The volume of the solid is equal to one third of the area of the base times the height. Therefore, the volume of the tetrahedron is equal to [tex](1/3)*(a^2)*h[/tex].
The volume of a pyramid (or tetrahedron) is equal to one third of the area of the base times the height. Therefore, if we were given a pyramid with a base that is an equilateral triangle with side a and a height of h, then the volume of the solid can be calculated by using the formula [tex](1/3)*(a^2)*h[/tex]. This is because an equilateral triangle has sides of equal length and all of its angles are equal to 60°. Since the area of an equilateral triangle is equal to [tex](a^2)*√3/4[/tex], then the volume of the solid can be calculated by multiplying the area of the base by one third and then multiplying it by the height of the pyramid, which is [tex](1/3)*(a^2)*√3/4*h[/tex]. The final result is the volume of the solid, which is [tex](1/3)*(a^2)*h[/tex].
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Which equation will solve the following word problem? Sarah spends an average of $64.11 per week at the grocery store. She spent $53.22 last week, and $64.11 this week. How much did Sarah spend two weeks ago?
Sarah spend $161.24 before two weeks.
What is Average?In mathematics, the middle value—which is determined by dividing the sum of all the values by the total number of values—is the average value in a set of numbers. To calculate the average of a set of data, add up all the values and divide the result by the total number of values.
Given:
Sarah spends an average of $64.11 per week.
She spent $53.22 last week, and $64.11 this week.
As, 1 month = 4.34524 weeks
So, before two weeks she spends
64.11 = (64.11 + 53.22 +x )/ 4.34524
278.5733364 = 117.33 + x
x= 161.24
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The ratio of fish to birds at a pet store is 8 to 3. Which combination of fish and birds could the pet store have?
A.
32 fish and 12 birds
B.
28 fish and 8 birds
C.
32 fish and 8 birds
D.
28 fish and 12 birds
Answer: A. 32 fish and 12 birds
Step-by-step explanation:
Since their greatest common factor is [tex]4[/tex], [tex]32\div 4= 8[/tex] and [tex]12\div 4 =3[/tex]. This satisfies the ration [tex]8:3[/tex].
Solve the following equation
Answer:
x=
Step-by-step explanation:
⅔x= 7x-1
2/3x=6
multiply both sides by 3/2
(3/2)(2/3x)= 6×3/2
x=
A metallurgist has one alloy containing 22% copper and another containing 53% copper. How many pounds of each alloy must he use to make 51 pounds of a third alloy containing 30% copper? (Round to two decimal places if necessary.)
Answer:
37.8387 pounds of the 22% alloy copper and 13.1612 pounds of the 53% alloy copper must be used.
Step-by-step explanation:
Let x represent the amount of 22% copper needed.
Therefore, 51-x represents the amount of 53% copper needed.
Therefore, we can write
(22% * x) + (53% * (51-x)) = 30% * (51)
⇒0.22x + 0.53(51-x) = 0.3(51)
⇒ x = 37.8387
Thus, x =37.8387 and 51-x = 13.1612
construct a scatter plot for the data.label your y-axis in increments of 50
After the graph is labeled and titled, it is complete and ready to be used to represent the relationship between the two variables.
What is data?Data is the collection of data term that is organized and formatted in a specific way it's typically contains fact observation or statistics that are collected through a process of measurement or research data set can be used to answer question and help make informed decision they can be used in a variety of ways such as to identify trends on cover patterns and make prediction.
A scatter plot is used to represent the relationship between two variables using data points. In this case, the x-axis would represent the data points, while the y-axis would be labeled in increments of 50. To construct a scatter plot, one must first gather the data points and then plot them on a graph. The data points should be connected with a line or points to form the scatter plot.
To begin, the data points must be collected and organized. This can be done by organizing the data points in a table, using two columns to represent the x-axis and y-axis values. Once the data is organized, the x-axis and y-axis values can then be plotted on a graph. The y-axis should then be labeled in increments of 50. Once the data points are plotted, a line or points should be used to connect the data points, forming the scatter plot.
Finally, the scatter plot should be labeled and given a title, if applicable. The x-axis should be labeled with the data points, while the y-axis should be labeled in increments of 50. The title should provide a brief description of what the scatter plot is depicting. After the graph is labeled and titled, it is complete and ready to be used to represent the relationship between the two variables.
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The weight of 3 identical containers holding a total of 9 gallons of fertilizer is 70.8 pounds. The weight of 5 of the containers holding a total of 15 gallons of fertilizer is 118.0 pounds. Can you determine the weight of each container?
Answer:
Step-by-step explanation:
Let's call the weight of each container "w". We can set up two equations based on the information given:
Equation 1: 3w = 70.8 (the weight of 3 containers holding 9 gallons)
Equation 2: 5w = 118.0 (the weight of 5 containers holding 15 gallons)
To solve for "w", we can first solve Equation 1 for "w":
3w = 70.8
w = 70.8/3
w = 23.6
Now we can substitute this value of "w" into Equation 2 and solve for the total weight of 5 containers:
5w = 118.0
5(23.6) = 118.0
So each container weighs 23.6 pounds.
Which of the following best describes the equation below? y = -5x^2 - 14 A. linear B. both linear and nonlinear C. neither linear nor nonlinear D. nonlinear
Answer:
D. Nonlinear
Step-by-step explanation:
y = -5x^2 - 14 is a parabola.
Linear lines are straight lines.
A parabola is not a straight line.