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3 years ago

Match the cube roots and square roots with their values.

Mathematics

1 answer:

stiks02 [169]3 years ago

4 0

Answer:

See the attachment

Step-by-step explanation:

If you don't have these memorized yet, your calculator can help you with this.

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Problem page the length of a rectangle is four times its width. if the perimeter of the rectangle is 70 cm , find its area.

agasfer [191]

So we can call the width of the rectangle x.
So then the length would be 4x.
The perimeter would then be 10x.
Since the perimeter is 70, we can say 70 = 10x.
And then simplify that to 7 = x.
So the length of a rectangle would be 28 cm, and the width would be 7.
So to find the area, just multiply length by width.
28*7 = 196 square cm
So the rectangle's area is 196 square cm.

I hope I helped!

5 0

4 years ago

Calculating the degrees of freedom, the sample variance, and the estimated standard error for evaluations using the t statistic

Yuliya22 [10]

Answer:

a) For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

b) $s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

c) For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

Step-by-step explanation:

Part a

For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

Part b

From a sample we know that n=41 and SS= 600, where SS represent the sum of quares given by:

$SS = \sum_{i=1}^n (X_i -\bar X)^2$

And the sample variance for this case can be calculated from this formula:

$s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

Part c

For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

8 0

3 years ago

The number of gal of water used to water trees is 30 times the number of trees

Oksi-84 [34.3K]

Are you trying to make an algebraic equation?

x = # of trees
y = gal of water

It would be 30x = y

7 0

3 years ago

Find each missing measure <br> Help please

skad [1K]

Angle m and n are 76 P Q and R are 60

7 0

3 years ago

The inverse of (5x – 1) and 5x

kozerog [31]

Answer:

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Interchange the variables.

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Tap for more steps...

Solve for

and replace with

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(

)

(

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Tap for more steps...

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(

)

Step-by-step explanation:

7 0

4 years ago