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White raven [17]
3 years ago
6

10. For f(x) = 3 - 5x, find f(-5). A. –22 B. -7 C. 3 D. 28

Mathematics
1 answer:
Artist 52 [7]3 years ago
4 0

Answer:

D

Step-by-step explanation:

3 - 5( - 5) \\ 3 - ( - 25) \\ 3 + 25 \\ 28

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kolbaska11 [484]
Given:
Sample proportion = 85% = 0.85.
Confidence level (CL) = 90%.
Confidence interval (CI) \hat{p} \pm z^{*} \sqrt{ \frac{\hat{p}(1-\hat{p})}{n} }  \\ where \\ n=sample\, size \\ z^{*}=1.645 \, at \, 90\% \, CL

We want the confidence interval to be 5% or 0.05. Therefore
0.85 - 1.645 \sqrt{ \frac{0.85(1-0.85)}{n} }=0.05 \\ 0.85 -  \frac{0.5874}{ \sqrt{n} } =0.05 \\  \frac{0.5874}{ \sqrt{n} }=0.8 \\  \sqrt{n} = .7342 \\ n=0.54

Because this number is less than 1, a default sample size of 30 (for the normal distribution) is recommended.

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3 0
3 years ago
Diana works in a building that is 130 feet tall. She is outside, looking up at the building at an angle of 37° from her feet to
AveGali [126]
Let x be her initial distance from the building, then tan 37 = 130/x
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Let y be her distance from the building after moving forward, then
tan 40 = 130/y
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After moving forward, she is 172.5 - 154.9 = 17.6 ft closer.
4 0
3 years ago
What is the slope indicated in the table below? Х 10 20 40 Y 20 17 14 11 30​
Leya [2.2K]

Answer:

answer might be

10/-3

Step-by-step explanation:

3 0
2 years ago
Why wasn't i doing this sooner :)
Licemer1 [7]

Step-by-step explanation:

Morning is 4 hr 15 min

afternoon is 4 hour 15 min

together is 8 hour 30 min

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7 0
3 years ago
Compute the value of the discriminant and give the number of real solutions of the quadratic equation.
Sergio039 [100]
-2x^2+6x-3=0 \\ \\
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The value of the discriminant is 12.
Since the discriminant is greater than zero, the equation has two real solutions.
4 0
3 years ago
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