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3 years ago

The length of a rectangle is 7 inches longer than its width. If the area of the

Mathematics

2 answers:

elixir [45]3 years ago

7 0

I’m just here so I could ask a question

olasank [31]3 years ago

7 0

Let’s represent the length of the rectangle as x and the width as y.
So always try to make a relationship between the unknowns so you don’t have a lot of variables
Now
The length of the triangle could be represented by width+7=length in other words y+7=x
So you could substitute x in the equation of x*y=144
(Y+7)(y)=144
So y^2+7=144
Y=11.7 x=18.7

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3 years ago

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A population has a standard deviation of 5.5. What is the standard error of the sampling distribution if the sample size is 81?

VladimirAG [237]

Answer:

$\sigma = 5.5$

And we have a sample size of n =81. We want to estimate the standard error of the sampling distribution $\bar X$ and for this case we know that the distribution is given by:

$\bar X \sim N(\mu ,\frac{\sigma}{\sqrt{n}})$

And the standard error would be:

$\sigma_{\bar x}= \frac{\sigma}{\sqrt{n}}$

And replacing we got:

$\sigma_{\bar x}=\frac{5.5}{\sqrt{81}}= 0.611$

Step-by-step explanation:

For this case we know the population deviation given by:

$\sigma = 5.5$

And we have a sample size of n =81. We want to estimate the standard error of the sampling distribution $\bar X$ and for this case we know that the distribution is given by:

$\bar X \sim N(\mu ,\frac{\sigma}{\sqrt{n}})$

And the standard error would be:

$\sigma_{\bar x}= \frac{\sigma}{\sqrt{n}}$

And replacing we got:

$\sigma_{\bar x}=\frac{5.5}{\sqrt{81}}= 0.611$

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3 years ago

What is the most efficient way to use surface area in math

timofeeve [1]

Answer: label the length (l), width (w), and height (h) of the prism and use the formula, SA=2lw+2lh+2hw, to find the surface area.

Step-by-step explanation:

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3 years ago

Please help me if you love your mom

kari74 [83]

Answer:

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Step-by-step explanation:

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A = (2 × 1.7) /2 × 6 = 10.2

or by the side length

A = 3√3/2 * 2² = 10.3

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3 years ago

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