All categories

2 years ago

I don't understand this quadratic functions question please help.

Mathematics

1 answer:

djyliett [7]2 years ago

6 0

I think it would be b

You might be interested in

A cylinder has a radius of 5x + 3 and a height of 4x + 2. Which polynmial in standard form best describes the total volume of th

devlian [24]

V=π(r)2 (h)
3.141592(5x+3)2 (4x+2)

6 0

3 years ago

Please Help! GEOMETRY!

lara31 [8.8K]

I think the answer should be A n goodluck

3 0

3 years ago

Read 2 more answers

KL is congruent toMN and your answer.

andrey2020 [161]

Uwu eye37373737474747484

8 0

2 years ago

Alex has collected apples. It has 40 boxes of 8.5 kg each and 6 sacks of 90kg each. Pack the apples in bags of 2.5 kg each. how

zimovet [89]

Answer:

40*8.5=340

6*90=540

total=880/2.5=352bags

3 0

2 years ago

A confidence interval was used to estimate the proportion of statistics students that are female. A random sample of 72 statisti

jeyben [28]

Answer:

We need a sample of size at least 13.

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:

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

90% confidence interval: (0.438, 0.642).

The proportion estimate is the halfway point of these two bounds. So

$\pi = \frac{0.438 + 0.642}{2} = 0.54$

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 $Z = 1.96$ .

Using the information above, what size sample would be necessary if we wanted to estimate the true proportion to within ±0.08 using 95% confidence?

We need a sample of size at least n.

n is found when M = 0.08. So

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

$0.08 = 1.96\sqrt{\frac{0.54*0.46}{n}}$