The solution of the inequality using the coordinate pair is 5.
What is Linear Inequality?Linear inequalities are those expressions which are connected by inequality signs like >, <, ≤, ≥ and ≠ and the value of the exponent of the variable is 1.
Given linear inequality is,
y ≤ -2x + 3
We have a coordinate pair (-1, 5).
So substitute x = -1 and y = 5 in the given inequality.
5 ≤ (-2 × -1) + 3
5 ≤ 2 + 3
5 ≤ 5
Hence the missing numbers are found.
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Using Heron's formula, show that the equilateral triangle has the maximum area for any fixed perimeter. Hint: In xyz≤k.
maximum occurs when x=y=z
Heron's formula states that the area of a triangle can be found using the following formula:[tex]A = √s(s-a)(s-b)(s-c)[/tex] where s is the semiperimeter of the triangle [tex](s = (a + b + c)/2)[/tex].
In the case of an equilateral triangle, all three sides (a, b, and c) are the same length. So, if we set x = y = z in the formula, we get [tex]A = √s(s-x)(s-x)(s-x).[/tex] Simplifying this expression yields [tex]A = (√s/4) * x^2[/tex].
We can also write the perimeter of the triangle as P = 3x. Substituting this into the area formula, we get [tex]A = [(P/3)*√3/4] * (P/3)^2[/tex]. This expression can be simplified to [tex]A = (1/12) * P^2 * √3.[/tex]
This shows that for a fixed perimeter, the area of an equilateral triangle is maximized. This is due to the fact that the area is proportional to the square of the sides, and in an equilateral triangle all sides are equal, thus maximizing the area. Heron's formula states that the area of a triangle can be found using the following formula: A = √s(s-a)(s-b)(s-c) where s is the semiperimeter of the triangle (s = (a + b + c)/2).
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(1 point) how many 3 -element subsets containing the letter a can be formed from the set {a,b,c,d,e,f,g} ?
From the set a, b, c, d, e, f, g, we can derive 15 3-element subsets having the letter "a".
We can select 2 more elements from the set's remaining 6 components to create a 3-element subgroup that includes the letter "a": a, b, c, d, e, f, g.
The binomial coefficient indicates the number of possible methods to select 2 elements from a set of 6:
C(6,2) = 6! / (2! * (6-2)!) = 15
The positive numbers that appear as coefficients in the binomial theorem are known as binomial coefficients in mathematics. A binomial coefficient is frequently written as ( ) and is indexed by the pair of numbers n k 0.displaystyle "tbinom" nk. It is the multiplicative formula that can be used to calculate the coefficient of the xk component in the polynomial expansion of the binomial power (1 + x)n.
Thus, from the set a, b, c, d, e, f, g, we can derive 15 3-element subsets having the letter "a".
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What is the probability of drawing a blue marble?
2/5
1/4
20%
30%
1/4 is the probability of drawing a blue marble .
What does math probability mean?
The area of mathematics known as probability explores potential outcomes of events, along with the likelihoods and distributions of those occurrences. It is predicated on the likelihood that something will occur. The logic underpinning probability serves as the foundation for theoretical probability.
For instance, the theoretical chance of receiving a head while tossing a coin is 12. There are four primary categories of probability: axiomatic, axiomatic, classical, and empirical. Probability is the area of mathematics that deals with the possibility of a random event.
total red balls = 5
total green balls = 3
total blue balls = 2
The probability of drawing a blue marble is now = 1/4.
The probability of drawing a red marble = 2/5.
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Hey can someone explain this step by step please? thx
The probability that outmost 15 calls will be received is 0.2
What is probability?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%.
The probability of receiving more than 15 calls is 0.8 i.ep( > 15) = 0.8
The total probability is 1
Therefore ,
the probability of receiving at most 15 calls is 0.2
i.e p( ≤15 ) = 1-0.8
= 0.2
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Systems that can absorb any type of data, structured or not, from any type of source are often called schema-less.TrueFalse
True. Systems that can absorb any type of data, structured or not, from any type of source are often referred to as schema-less.
In a schema-less system, there is no predefined structure or schema that the data must conform to, allowing for greater flexibility in handling a variety of data formats and sources.
This can be particularly useful in big data environments, where data may come from a wide range of sources and be in a variety of formats. Schema-less systems typically rely on techniques such as dynamic schema discovery and schema-on-read to interpret and process the data.
A schema-less system is a type of database management system that allows for flexible and dynamic data structures, without requiring a pre-defined schema or structure.
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How do i do this could someone teach me
The area of the given figure will be 145.13 m².
The area of a rectangle is calculated as length multiplied by width, while the area of a semi-circle is half the area of a circle with the same radius. We can calculate the combined area of the rectangle and semi-circle as follows:
Area of rectangle = length x width = 15 m x 8 m = 120 m^2
Area of semi-circle = 1/2 x pi x radius^2 = 1/2 x pi x 4^2 = 8 pi m^2
To find the total combined area, we add the area of the rectangle to the area of the semi-circle:
Total combined area = Area of rectangle + Area of the semi-circle
= 120 m² + 8π m²
= 120 m² + 25.13 m² (using π= 3.14159)
= 145.13 m
Therefore, the combined area of the rectangle and semi-circle is 145.13 square meters (rounded to two decimal places).
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use equation 1.3 to estimate the solar radius r^2 from its luminosity and effective temperature. show that the gravitational acceleration g at the surface is about 30 times larger than that on earth. L=4 phi R^2 SB θ T^4
The solar radius R² from its luminosity and effective temperature is R ≈ 695586.468 km.
We can find solar radius by direct substitution of values into Eqn 1.3
See the pic below,
Given L = 4πR²σT⁴
where,
L is the Luminosity
R solar radius
T the effective temperature
σ is the Stefan Boltman's constant
From 1 solar radius can be written as,
R² = L/4πσT⁴
L = 3.846 x 10²⁶
R² = 3.846x10²⁶/4x3.14x5.6703x10⁻⁸ x 5780⁴
R ≈ 695586.468 km
Therefore, the solar radius is R ≈ 695586.468 km
g = GM/r²
g = 6.67x10⁻¹¹ x 1.99 x 10³⁰/(6.95x10⁸)²
g = 274.13m/s² about 30 times that of earth.
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A survey of 138 investment managers in a poll revealed the following. • 44% of managers classified themselves as bullish or very bullish on the stock market. • The average expected return over the next 12 months for equities was 11.8%. • 22% selected health care as the sector most likely to lead the market in the next 12 months.• When asked to estimate how long it would take for technology and telecom stocks to resume sustainable growth, the managers' average response was 2.9 years. (a) Cite two descriptive statistics. (Select all that apply.) - of those investment managers surveyed, 46% were bullish or very bullish on the stock market.- of those investment managers surveyed, 46% selected technology and telecom stocks to be the sector most likely to lead the market in the next 12 months. - of those investment managers surveyed, 11.9% expect it would take 12 months for equities to resume sustainable growth. - of those investment managers surveyed, 46% were bullish or very bullish on health care stocks over the next 2.6 years. - Of those investment managers surveyed, 22% selected health care as the sector most likely to lead the market in the next 12 months. (b) Make an inference about the population of all investment managers concerning the average return expected on equities over the next 12 months. We estimate the average expected 12-month return on equities for --Select--- to be (c) Make an inference about the length of time it will take for technology and telecom stocks to resume sustainable growth. to be to be years. yea We estimate the average length of time it will take for technology and telecom stocks to resume sustainable growth for ---Select--- ---Select--- investment managers in the sample
(a) Descriptive statistics from the survey are 44%, 11.8%.
(b) All investment managers is estimated to have an average expected 12-month return on equities of 11.8%.
(c) Based on the sample, we can estimate that it will take an average of 2.9 years for technology and telecom stocks
Descriptive statistics from the survey are: (i) 44% of managers classified themselves as bullish or very bullish on the stock market, and (ii) the average expected return over the next 12 months for equities was 11.8%.
Based on the sample, we can infer that the population of all investment managers is estimated to have an average expected 12-month return on equities of 11.8%.
Based on the sample, we can estimate that it will take an average of 2.9 years for technology and telecom stocks to resume sustainable growth according to the population of all investment managers.
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[tex]27 / =12/16[/tex]
Answer:
if my calculation is correct the answer is 16 3/8-9 5/8 - fraction calculator. The result is 27/4 = 6 3/4 = 6.75 = twenty-seven quarters (or six and three quarters)
Step-by-step explanation:
I need help, please some one explain
Answer:
Below
Step-by-step explanation:
DE is MID segment.....so it cuts AC in half....then x = 6
Computing exponents mod m. ? Compute each quantity below using the methods outlined in this section. Show your steps, and remember that you should not use a calculator (a) 4610 mod 7 (b) 345 mod 9 Feedback?
(a) The answer is 3. To solve 4610 mod 7, we start by dividing 4610 by 7, which gives us 658 with a remainder of 4. Next, we divide 658 by 7, which gives us 93 with a remainder of 5. We keep dividing by 7 until we reach a number below 7. This gives us a remainder of 3, so the answer is 3.
(b) The answer is 6. To solve 345 mod 9, we start by dividing 345 by 9, which gives us 38 with a remainder of 3. Next, we divide 38 by 9, which gives us 4 with a remainder of 2.
We keep dividing by 9 until we reach a number below 9. This gives us a remainder of 6, so the answer is 6.
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The area of a rectangular room is 750 square feet. The width of the room is 5 feet less than the length of the room. Which equations can be used to solve for y, the length of the room? Select three options. y(y + 5) = 750 y2 – 5y = 750 750 – y(y – 5) = 0 y(y – 5) + 750 = 0 (y + 25)(y – 30) = 0
The equations can be used to solve for y, the length of the room follows:
B. y² – 5y = 750, C. 750 – y(y – 5) = 0 and E. (y + 25)(y – 30) = 0
What is the area of the rectangle?The area of a rectangle is defined as the product of the length and width.
The area of a rectangle = L × W
Where W is the width of the rectangle and L is the length of the rectangle
As per the question, we have
length L = y
width W = y - 5
Since the area of a rectangular room is 750 square feet.
So L × W = 750
y(y - 5) = 750
y² – 5y = 750 ....(i)
This can be also written as:
750 – y(y – 5) = 0 ....(ii)
Factorizing the equation (i), we get
(y + 25)(y – 30) = 0
Thus, the correct answer would be options (B), (C), and (E).
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Ashirt is marked down 20% off the original price. If the original
price was $24,00, what is the sale price of the shirt before sales tax?
Help me with this …………
Answer:
it's C
the square root of 10 is 3.162277
3. two dice are thrown. consider the sample space with 36 (equally likely) outcomes. let sj be the event that the total of the values which come up on the dice is j. find p(s2), p(s3), p(s4), p(s5), p(s6), p(s7), and p(s8); in doing so, show all the outcomes in each event being considered.
The value of the probability p(s2) is 1.36, p(s3) is 1/18, p(s4) is 1/12, p(s5) is 1/9, p(s6) is 5/36, p(s7) is 1/6, and p(s8) 5/36
The sample space for this problem can be represented as all the possible outcomes when two dice are thrown.
Each die has six sides with numbers 1 through 6, so there are 6 x 6 = 36 possible outcomes. We can represent each outcome as a pair of numbers (i, j) where i is the number on the first die and j is the number on the second die.
Now, we want to find the probability of getting a certain total when the two dice are thrown. We can define an event Sj as the event where the total of the values on the dice is j.
To calculate the probability of each event, we need to count the number of outcomes that belong to each event, and divide by the total number of outcomes (which is 36).
Let's start with S2. The only outcome that belongs to this event is (1, 1), so the probability of getting a total of 2 is 1/36.
For S3, we can get a total of 3 in two ways: (1, 2) and (2, 1). So the probability of getting a total of 3 is 2/36 or 1/18.
For S4, we can get a total of 4 in three ways: (1, 3), (2, 2), and (3, 1). So the probability of getting a total of 4 is 3/36 or 1/12.
For S5, we can get a total of 5 in four ways: (1, 4), (2, 3), (3, 2), and (4, 1). So the probability of getting a total of 5 is 4/36 or 1/9.
For S6, we can get a total of 6 in five ways: (1, 5), (2, 4), (3, 3), (4, 2), and (5, 1). So the probability of getting a total of 6 is 5/36.
For S7, we can get a total of 7 in six ways: (1, 6), (2, 5), (3, 4), (4, 3), (5, 2), and (6, 1). So the probability of getting a total of 7 is 6/36 or 1/6.
Finally, for S8, we can get a total of 8 in five ways: (2, 6), (3, 5), (4, 4), (5, 3), and (6, 2). So the probability of getting a total of 8 is 5/36.
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in a lab experiment, a population of 200 bacteria is able to quadruple every hour. Which equation matches the number of bacteria in the population after 2 hours?
The equation that gives the number of bacteria in the population after 2 hours is -
P{ 2 } = 260 + (1/4 x 260)
What is exponential function?The exponential function is given by -
y = eˣ
Given is that in a lab experiment, a population of 200 bacteria is able to quadruple every hour.
The population of the bacteria after the first hour is -
P{ 1 } = 200 + (1/4 x 200) = 200 + 60 = 260 bacterias.
The population of the bacteria after the second hour is -
P{ 2 } = 260 + (1/4 x 260) = 260 + 65 = 325 bacterias
After the second hour, the population of the bacteria would be -
P{ 2 } = 260 + (1/4 x 260)
Therefore, the equation that gives the number of bacteria in the population after 2 hours is -
P{ 2 } = 260 + (1/4 x 260)
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Complete the input-output table:
X 3x²+2
Answer:
Here's the completed input-output table for the function f(x) = 3x²+2:
X f(X)
-2 14
-1 5
0 2
1 5
2 14
Step-by-step explanation:
The probability that a randomly selected box of a certain type of cereal has a particular prize is 0.4. Suppose you purchase box after box until you have obtained two of these prizes. (a) What is the probability that you purchase x boxes that do not have the desired prize? nb(x; 2, 0.4) b(x; 2, 4, 10) b(x; 2, 0.4) h(x; 2, 4, 10) h(x; 2, 0.4) nb(x; 2, 4, 10)
(b) What is the probability that you purchase four boxes? (Round your answer to four decimal places.) (c) What is the probability that you purchase at most four boxes? (Round your answer to four decimal places.) (d) How many boxes without the desired prize do you expect to purchase? How many boxes do you expect to purchase?
a) Probability will be [tex]nb(x; 2, 0.4) = (x + 1 choose 2) * (0.4)^2 * (0.6)^(x)[/tex]
b)Probability is b(2; 4, 0.4) = [tex](4 choose 2) * (0.4)^2 * (0.6)^2[/tex] = 0.2304 (rounded to four decimal places)
c)b(2; 2, 0.4) =[tex](2 choose 2) * (0.4)^2 * (0.6)^0[/tex] = 0.16
d)E(X) = r*(1-p)/p = 2*0.6/0.4 = 3 boxes
(a) The probability that x boxes do not have the desired prize can be modeled by a negative binomial distribution with parameters r=2 (since we want to obtain 2 prizes), p=0.4 (since the probability of obtaining the prize in any given box is 0.4), and x being the number of boxes purchased before obtaining the second prize. Therefore, the probability is given by:
[tex]nb(x; 2, 0.4) = (x + 1 choose 2) * (0.4)^2 * (0.6)^(x)[/tex]
(b) The probability of purchasing four boxes and obtaining two prizes can be modeled by a binomial distribution with parameters n=4 (since four boxes are purchased), k=2 (since we want to obtain two prizes), and p=0.4 (since the probability of obtaining the prize in any given box is 0.4). Therefore, the probability is given by:
b(2; 4, 0.4) = [tex](4 choose 2) * (0.4)^2 * (0.6)^2[/tex] = 0.2304 (rounded to four decimal places)
(c) The probability of purchasing at most four boxes and obtaining two prizes can be found by summing the probabilities of purchasing 2, 3, or 4 boxes and obtaining two prizes. Using the binomial distribution with parameters n=2 and p=0.4 for the case of purchasing 2 boxes and obtaining two prizes, we have:
b(2; 2, 0.4) =[tex](2 choose 2) * (0.4)^2 * (0.6)^0[/tex] = 0.16
Using the negative binomial distribution with parameters r=2 and p=0.4 for the case of purchasing 3 boxes and obtaining two prizes, we have:
nb(1; 2, 0.4) = (1 + 2 choose 2) * (0.4)^2 * (0.6)^1 = 0.288
Using the negative binomial distribution with parameters r=2 and p=0.4 for the case of purchasing 4 boxes and obtaining two prizes, we have:
nb(2; 2, 0.4) = (2 + 2 choose 2) * (0.4)^2 * (0.6)^2 = 0.3456
Therefore, the probability of obtaining two prizes in at most four boxes is:
0.16 + 0.288 + 0.3456 = 0.7936 (rounded to four decimal places)
(d) The expected number of boxes without the desired prize can be found by multiplying the number of boxes needed to obtain the prize (on average) by the probability of not obtaining the prize, which is given by:
E(X) = (1 - p)/p = 0.6/0.4 = 1.5 boxes
The expected number of boxes needed to obtain two prizes can be found using the negative binomial distribution with parameters r=2 and p=0.4, which gives:
E(X) = r*(1-p)/p = 2*0.6/0.4 = 3 boxes
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Write the log equation as an exponential equation. You do not need to solve for X
ln(x^2 - 5x + 17) = 3x+2
As an exponential equation, the log equation log (x²- 5x + 14) = 2x + 4 is 9514 1404 393
What is meant by exponential equation?The formula for an exponential function is f (x) = ax, where x is a variable and an is a constant that serves as the function's base and must be bigger than 0. The transcendental number e, or roughly 2.71828, is the most often used exponential function basis. Your function must be exponential if it can be expressed in the manner y = a b x, where and are constants, a 0 and b > 0 and b 1. Your functions were always to the second power in quadratic equations. The exponent is a variable in exponential functions.Given,
x² - 5x + 14 = 10^(2x +4)
The relationship is ...
log(a) = b ⇔ a = 10^b
Using this with a = x² - 5x + 14 and b = 2x + 4, we have ...
x² - 5x + 14 = 10^(2x +4)
The complete question is:
Write the log equation as an exponential equation. You do not need to solve for x. log (x^2– 5x + 14) = 2x + 4
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factoring a polynomial is essentially dividing, True or false
15. There are 15 children on a soccer team and 4 more than one-third that number on the tennis team. On the basketball team there are 2 less than three times the number of students that are on the tennis team. All of the athletes from the three teams got together for a pizza party. How many athletes were at the pizza party?
PLEASE ANSWER ASAP
Answer:
49 athletes attended the pizza party
Step-by-step explanation:
Number of soccer team players = 15
Number of tennis players = 4 more than one-third that number
This translates to
Number of tennis players = 15/3 + 4 = 5 + 4 = 9
Number of basketball players = 2 less than three times the number of students that are on the tennis team
which translates to
3 x 9 - 2 = 25
So total number of players on all teams = 15 + 9 + 25 =49
suppose: 1. all the points on a scatterplot lie perfectly on a straight line going uphill 2. the mean of x and the mean of y are both 2 3 the standard deviations of x and y are exactly the same. can you find the equation of the best fitting line with this information? (hint: think of the '5 number' way of finding the best-fitting line.) no, yes
Yes, we can find the equation of the best fitting line given the information provided.
Since all the points lie perfectly on a straight line going uphill, we know that there is a perfect linear relationship between x and y. Therefore, we can use the method of least squares to find the equation of the best fitting line.
The method of least squares involves finding the line that minimizes the sum of the squared distances between the observed data points and the predicted values on the line.
Given that the mean of x and the mean of y are both 2, we know that the line must pass through the point (2,2).
Since the standard deviations of x and y are exactly the same, we know that the slope of the line must be 1 (i.e., a unit increase in x corresponds to a unit increase in y).
Using the "5 number" approach, we can also find the equation of the line by calculating the correlation coefficient (r) between x and y. Since all the points lie perfectly on a straight line going uphill, the correlation coefficient will be either 1 or -1. In this case, since the line goes uphill, we know that the correlation coefficient must be 1.
Therefore, the equation of the best fitting line is y = x, or in slope-intercept form, y = 1x + 0.
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y and x form a proportional relationship, and = 14 and y = 35 What is y when x equals 8?
Mary didn't know the answer to three multiple choice questions that had three answer choices each, so she picked her answers randomly. What is the fractional probability that Mary answered all three correctly?
Answer: 1/27, or 0.037
Step-by-step explanation:
The fractional probability that Mary answered all three correctly is 1/27, or 0.037. This is because for each of the three questions, Mary had a 1 in 3 chance of getting the correct answer (1/3). Since she had three questions, the probability of her getting all three correct is the product of the three probabilities (1/3 x 1/3 x 1/3 = 1/27).
Answer:
Mary's probability of guessing all three questions correctly is 1/27 or approximately 0.037. This is because each multiple choice question has 3 possible answer choices, and her chances of randomly picking the correct choice are 1/3. Since she has three questions, the probability of randomly getting all three answers correct is 1/3 x 1/3 x 1/3, which equals 1/27.
the sum of the digits of a certain two-digit number is7. reversing its digits increase the number by 9. what is the number?
Answer: the number is 12.
Step-by-step explanation:
Let's call the two-digit number "x". We know that the sum of its digits is 7, so we can represent the number as 10a + b, where a and b are the digits of the number and a is the tens digit and b is the units digit.
The statement that "reversing its digits increases the number by 9" means that the number obtained by reversing the digits is x + 9. We can represent this reversed number as 10b + a.
So, we have two equations:
10a + b = x
10b + a = x + 9
Now, we can substitute the value of x from the first equation into the second equation:
10b + a = 10a + b + 9
Expanding both sides, we get:
10b + a = 10a + b + 9
9b = 9a + 9
b = a + 1
We know that 0 < a < 9, since the number is a two-digit number. So, we can conclude that 0 < b < 10.
We can now substitute the value of b into the first equation:
10a + (a + 1) = x
11a + 1 = x
11a = x - 1
a = (x - 1) / 11
Since a is the tens digit of the number, it must be an integer. We can test different values of x to find the value that satisfies this condition.
If x = 20, then a = (20 - 1) / 11 = 1. This gives us b = a + 1 = 2. The original number is 10a + b = 10 + 2 = 12, which satisfies all the conditions.
So, the number is 12.
Today's Challenge
Number Sense
What will be the color of a
flower dipped in a mixture
3/5
that is red? Explain how
you know.
Food Coloring to Put in Water to Change
the Color of a White Carnation
Carnation Color
Orange Sunset-10 yellow and 2 red
Purple-6 red and 4 blue
Jungle Green-6 green and 2 yellow
Watermelon Red-7 red and 1 blue
Drops of Food Coloring
DAY
The color of a mixture that is 3/5 red is given as follows:
Purple.
How to obtain the color?To obtain the color, we must look at the proportions in the context of the problem.
The proportion of red of each mixture is obtained dividing the number of red drops by the total number of drops, hence:
Orange: 2/12 = 1/6.Purple: 6/10 = 3/5. -> 3/5 red.Jungle Green: 6/13.Watermelon red: 7/8.More can be learned about proportions at https://brainly.com/question/24372153
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Consider the following equation.
5y+7x=7(5+x)
Step 1 of 2 : Find the x- and y-intercepts, if possible.
answer: 7 is where they intercept I think, I also hope this helps
Identify a pair of corresponding angles. 1 2 3 4 5 6 7 8 x y graph Question content area bottom Part 1 Choose the correct answer below. A. ∠3 and ∠7 B. ∠6 and ∠8 C. ∠3 and ∠2 D.
Answer:
/9 gr2146787. 2665444755554
Please help !! I can’t figure it out
Answer:
121 3
Step-by-step explanation:
A recent survey indicated that the mean time spent on a music streaming service is 210 minutes per week for the population of a certain country. A simulation was conducted to create a sampling distribution of the sample mean for a population with a mean of 210. The following histogram shows the results of the simulation.Which of the following would be the best reason why the simulation of the sampling distribution is not approximately normal?
The population size varies in several ways. The sample size was insufficient, which is the best explanation for why the simulation of the sampling distribution is not roughly normal.
A person's or a researcher's choice of sample size will limit the study's statistical power if it is too small or inadequate for the alpha level and the analyses they have decided to do.
Because of the aforementioned, it is much harder to determine from one's sample whether a statistical effect is existent in the population.
A sample size that is either too small or too large can affect the ability to extrapolate the results, with the latter increasing the detection of differences and accentuating statistical differences that are not clinically significant.
The complete question is:-
A recent survey indicated that the mean time spent on a music streaming service is 210 minutes per week for the population of a certain country. A simulation was conducted to create a sampling distribution of the sample mean for a population with a mean of 210. The following histogram shows the results of the simulation.Which of the following would be the best reason why the simulation of the sampling distribution is not approximately normal?
A. The samples were not selected at random.
B . The sample size was not sufficiently large.
C. The population distribution was approximately normal.
D. The samples were selected without replacement.
E. The sample means were less than the population mean.
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