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dmitriy555 [2]
3 years ago
9

I need help with these questions please ASAP!!!!!!

Mathematics
2 answers:
Effectus [21]3 years ago
7 0

Answer:

Your answers are 1.A 2.T 3.C 4.A

leonid [27]3 years ago
5 0
Read it #1 would be A. Read it #2 would be False. Read it #3 would be D (not sure on that one) and Read it #4 would be A
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Beth purchased a computer, and its value depreciated exponentially each year. Beth will sketch a graph of the situation, where x
Katyanochek1 [597]

What is x?

It is the number of years since purchase. Can this be negative?

NO! Years cannot be negative. So we disregard negative x-axis.


What is y?

It is the value of the computer at that year. A computer starts off with a positive value (y axis) and depreciates to 0 after some years. Can this be negative?

NO! At 0 value, the computer is worth nothing! There is nothing known as <em>negative </em>value. So we disregard negative y-axis.


The graph that Beth will sketch will have to be in the 1st quadrant (positive x-axis & positive y-axis).

ANSWER: Quadrant I only

3 0
3 years ago
suppose a parabola has an axis of symmetry at x=-2 a minimum height at -6 and passes through the point (0,10)
andre [41]
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8 0
3 years ago
Does this graph represent a function? Why or why not?
bija089 [108]
D. No x value has more than one y value so it's a function.
8 0
2 years ago
Read 2 more answers
A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained i
Scorpion4ik [409]

Answer:

a) We need a sample size of at least 3109.

b) We need a sample size of at least 4145.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

99% confidence level

So \alpha = 0.01, z is the value of Z that has a pvalue of 1 - \frac{0.01}{2} = 0.995, so Z = 2.575.

(a) he uses a previous estimate of 25​%?

we need a sample of size at least n.

n is found when M = 0.02, \pi = 0.25. So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.02 = 2.575\sqrt{\frac{0.25*0.75}{n}}

0.02\sqrt{n} = 2.575\sqrt{0.25*0.75}

\sqrt{n} = \frac{2.575\sqrt{0.25*0.75}}{0.02}

(\sqrt{n})^{2} = (\frac{2.575\sqrt{0.25*0.75}}{0.02})^{2}

n = 3108.1

We need a sample size of at least 3109.

(b) he does not use any prior​ estimates?

When we do not use any prior estimate, we use \pi = 0.5

So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.02 = 2.575\sqrt{\frac{0.5*0.5}{n}}

0.02\sqrt{n} = 2.575\sqrt{0.5*0.5}

\sqrt{n} = \frac{2.575\sqrt{0.5*0.5}}{0.02}

(\sqrt{n})^{2} = (\frac{2.575\sqrt{0.5*0.5}}{0.02})^{2}

n = 4144.1

Rounding up

We need a sample size of at least 4145.

8 0
3 years ago
If the dimension of a square is 3 1/2 what would the perimeter be?
Eduardwww [97]
It would be 3 because in a half means like cut so what is in the middle between 2 and 4? 3 so that is correct



6 0
2 years ago
Read 2 more answers
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