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skelet666 [1.2K]
3 years ago
7

Please help ill rate you 5 and follow yoy and like maybe even brainlist!

Mathematics
1 answer:
Nataly_w [17]3 years ago
5 0
(a) y >_ 13
(b) x > 17.5

Explanations:

(a)
24.2 - y <_ 11.2
- y <_ 11.2 - 24.2
-y <_ -13
y >_ 13

(b)
- 12.5 + x > 5
x > 5 + 12.5
x > 17.5

(<_ means “less than or equal to” and >_ means “greater than or equal to”)
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Given C=n+15, determine the value of C when n=4
puteri [66]

Answer: c=19 and n=4

please mark as brainliest  if it helped

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find the present value that will grow to $7000 if the annual interest rate is 3.5% compounded quarterly for 9 uears
Gwar [14]
PV=FV/(1+i)^t

FV=7000, i=3.5%=0.035,t=9

put everything in the formula
PV=7000/(1+0.035)^9
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7 0
3 years ago
At 95% confidence, how large a sample should be taken to obtain a margin of error of 0.03 for the estimation of a population pro
Gnom [1K]

Answer:

A sample of 1068 is needed.

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}}

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

At 95% confidence, how large a sample should be taken to obtain a margin of error of 0.03 for the estimation of a population proportion?

We need a sample of n.

n is found when M = 0.03.

We have no prior estimate of \pi, so we use the worst case scenario, which is \pi = 0.5

Then

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

0.03 = 1.96\sqrt{\frac{0.5*0.5}{n}}

0.03\sqrt{n} = 1.96*0.5

\sqrt{n} = \frac{1.96*0.5}{0.03}

(\sqrt{n})^{2} = (\frac{1.96*0.5}{0.03})^{2}

n = 1067.11

Rounding up

A sample of 1068 is needed.

8 0
3 years ago
Please help I don’t know how to-
aivan3 [116]

Answer:

y is going back by 3's x is going back one

Step-by-step explanation:

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madreJ [45]
Paralell is smae slope so it is
2x+3y=c
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(9,-3)
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the equation is 2x+3y=9
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