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3 years ago

What expression is equivalent to 9y-3

Mathematics

2 answers:

BigorU [14]3 years ago

6 0

B because 3*3=9 And 3*1=3 so it would be 3(3y-1) foil the answer

Debora [2.8K]3 years ago

3 0

The answer is B, I took the test.

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On a coordinate plane, what is the distance between (-7, 3) and (2,3)?

Angelina_Jolie [31]

Answer:

The distance is 9

Step-by-step explanation:

Distance formula: $\sqrt{(x_{2}-x_{1} )^{2}+(y_{2} -y_{1})^2 }$

Plug in the points:

$\sqrt{(2-(-7))^{2}+(3-3)^2 } = \sqrt{(9)^{2}+(0)^2 } = \sqrt{(9)^2} = 9$

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3 years ago

The weights of a certain dog breed are approximately normally distributed with a mean of = 49 pounds, and a standard deviation o

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Answer:

Step-by-step explanation:

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3 years ago

Calculate the sample variance and sample standard deviation for the following frequency distribution of heights in centimeters f

Zolol [24]

Answer:

$\bar X = \frac{\sum_{i=1}^n X_i f_i}{n}= \frac{22026.1}{171}=128.81$

$s^2 = \frac{2839948.85- \frac{(22026.1)^2}{171}}{171-1}= 16.59$

$s= \sqrt{16.587}=4.07$

Step-by-step explanation:

For this case we can calculate the sample variance and deviation with the following table

Class Midpoint (Xi) fi Xi*fi Xi^2 *fi

120.6-123.6 122.1 17 2075.7 253443

123.7-126.7 125.2 49 6134.8 768077

126.8-129.8 128.3 29 3720.7 477365.8

129.9-132.9 131.4 41 5387.4 707904.4

133.0-136.0 134.5 35 4007.5 633158.8

___________________________________________

Total 171 22026.1 2839948.85

For this case we can calculate the mean or expected value with the following formula:

$\bar X = \frac{\sum_{i=1}^n X_i f_i}{n}= \frac{22026.1}{171}=128.81$

Now we can calculate the sample variance with the following formula:

$s^2 =\frac{\sum f_i X^2_i -[\frac{(\sum X_i f_i)}{n}]^2}{n-1}$

And if we replace we got:

$s^2 = \frac{2839948.85- \frac{(22026.1)^2}{171}}{171-1}= 16.59$

And the standard deviation would be the square root of the variance and we got:

$s= \sqrt{16.59}=4.07$

7 0

4 years ago

Please I need help

lisabon 2012 [21]

-1, -3/4, -5/8, -1/20, 0

Keep in mind that when ordering negative numbers from least to greatest, you will have to order them backwards. Think about it in terms of the distance from the number line. -1 is the farthest away from 0, therefore the least, -3/4 is the second farthest from 0, and so on.

5 0

4 years ago

Read 2 more answers

For what value of k are there two complex solutions to the given quadratic equation (k+1)x²+4kx+2=0.

nlexa [21]

Answer: $k\in \left ( \frac{-1}{2},1\right )$