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Deffense [45]
2 years ago
8

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
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