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2 years ago

The graph of r= 2 cos5 phi is symmetric about the _____.

Mathematics

1 answer:

tatiyna2 years ago

4 0

Answer:

Answer is b

Step-by-step explanation:

x-axis only

smh the other guy who asked for brainliest

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True of False:the following polynomial is written in standard form<br> 2x^4-x^3+5x^2+x-7

djyliett [7]

The following polynomial is not written in standard form so it is false

3 0

2 years ago

Solve for x.<br> z=(x-7)k

aliya0001 [1]

Answer:

$x=\frac{z}{k}+7$

Step-by-step explanation:

we have

$z=(x-7)k$

solve for x

That means ----> isolate the variable x

Divide by k both sides

$\frac{z}{k}=x-7$

Adds 7 both sides

$\frac{z}{k}+7=x$

Rewrite

$x=\frac{z}{k}+7$

5 0

3 years ago

SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An administrator at a college is inter

Rama09 [41]

Answer:

The administrator should sample 968 students.

Step-by-step explanation:

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

$\alpha = \frac{1 - 0.88}{2} = 0.06$

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 p-value of $1 - 0.06 = 0.94$ , so Z = 1.555.

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.

Standard deviation of 300.

This means that $n = 300$

If the administrator would like to limit the margin of error of the 88% confidence interval to 15 points, how many students should the administrator sample?

This is n for which M = 15. So

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

$15 = 1.555\frac{300}{\sqrt{n}}$

$15\sqrt{n} = 300*1.555$

Dividing both sides by 15

$\sqrt{n} = 20*1.555$

$(\sqrt{n})^2 = (20*1.555)^2$

$n = 967.2$

Rounding up:

The administrator should sample 968 students.

5 0

2 years ago

Omar paid 5$ for his lunch and left a 3$ tip what percent did omar tip his server?

zheka24 [161]

Answer:

Step-by-step explanation:

5(p/100)=3 multiply each side by 100

5p=300 divide each side by 5

p=60%

6 0

3 years ago

Steps to how to solve this !

tiny-mole [99]

W is 38 to form a right angle
Z is 29 for the same reason
Y is 52 because of vertical angles

7 0

3 years ago