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andriy [413]
3 years ago
15

Find the value of the function sin 7pi/2

Mathematics
1 answer:
jekas [21]3 years ago
5 0
The closest is 0

Just plug that into a calculator
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Suppose we want a 90% confidence interval for the average amount spent on entertainment (movies, concerts, dates, etc.) by fresh
katovenus [111]

Answer:

609

Step-by-step explanation:

Standard deviation = \sigma = $30

Margin of error = E = $2

Confidence level = 90%

Since the distribution is said to be normal, we will use z scores to solve this problem.

The z score for 90% confidence level = z = 1.645

Sample size= n = ?

The formula to calculate the margin of error is:

E=z\frac{\sigma}{\sqrt{n}}\\\\\sqrt{n}=z\frac{\sigma}{E}\\\\n=(\frac{z\sigma}{E} )^{2}

Using the values in above equation, we get:

n=(\frac{1.645 \times 30}{2} )^{2}\\\\ n = 608.9

This means, the minimum number of observations required is 609

6 0
3 years ago
I need help solving this question. A large company is considering installing charging stations for electric cars in their compan
Oduvanchick [21]

Answer:

C; right answer on Khan Academy

Step-by-step explanation:

6 0
2 years ago
What are the roots of the polynomial equation? (picture below)
Marat540 [252]

Answer:

x = - 9, x = 0, x = 7

Step-by-step explanation:

Given

\frac{1}{2} x(x - 7)(x + 9) = 0 ← in standard form

Equate each factor to zero and solve for x

\frac{1}{2} x = 0 ⇒ x = 0

x - 7 = 0 ⇒ x = 7

x + 9 = 0 ⇒ x = - 9

3 0
2 years ago
Read 2 more answers
Please help me this is urgent.!
nata0808 [166]
V= 3.14• 5^2•4
V= 3.14 •25•4
V= 78.5•4
V=314

Sorry I couldn’t give a more detailed explanation but here is the original equation for volume of a cylinder:

V=πr2h

Hope this helps comment below for more questions :)
3 0
3 years ago
Read 2 more answers
What number is less than 337,676?
Sphinxa [80]
Not counting negative numbers there are 337,675 numbers less than 337,676
6 0
3 years ago
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