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2 years ago

T and F - question with a screenshot

Mathematics

1 answer:

emmainna [20.7K]2 years ago

4 0

Answer:

Try using The quadratic formula to help

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Jennifer has 84.5 yards of fabric to make curtains. She makes 6 identical curtains and has 19.7 yards of fabric remaining. How m

lara31 [8.8K]

Answer:

$10.8\ yd$

Step-by-step explanation:

Let

x-------> amount of yards of fabric that Jennifer used per curtain

we know that

The linear equation that represent this situation is

$6x=84.5-19.7$

Solve for x

$6x=84.5-19.7$

$6x=64.8$

$x=10.8\ yd$

4 0

3 years ago

Help me with my homework, please

loris [4]

Answer:

150°

Step-by-step explanation:

We know each angle in a equilateral triangle is 60° and that of a rectangle is 90° . So ,

$\implies \angle ABC = \angle DBC + \angle ABD \\\\\implies \angle ABC = 90^o + 60^o \\\\\implies \boxed{\boxed{ \angle ABC = 150^o }}$

3 0

3 years ago

3. university dean of students wishes to estimate the average number of hours students spend doing homework per week. The standa

gregori [183]

Answer:

A sample of 17 must be selected.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.96}{2} = 0.02$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.02 = 0.98$ , so Z = 2.054.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The standard deviation from a previous study is 4 hours.

This means that $\sigma = 4$

How large a sample must be selected if he wants to be 96% confident of finding whether the true mean differs from the sample mean by 2 hours?

A sample of n is required.

n is found for M = 2. So

$M = z\frac{\sigma}{\sqrt{n}}$

$2 = 2.054\frac{4}{\sqrt{n}}$

$2\sqrt{n} = 2.054*4$

Simplifying both sides by 2:

$\sqrt{n} = 2.054*2$

$(\sqrt{n})^2 = (2.054*2)^2$

$n = 16.88$

Rounding up:

A sample of 17 must be selected.

8 0

3 years ago

Help please tia everyone!

MariettaO [177]

B=3 i believe but not positive

6 0

3 years ago

WHO WANTS BRAINLIEST ANSWER!!!!!! PLZ HELP ME RN!!!! I NEED HELP ASAP!!!!!!!!

Bond [772]

I got D, but it had a decimal at the end between the 2 and the 6.
But i still got D. So D is my answer.

6 0

3 years ago