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victus00 [196]
2 years ago
6

Simplify: 3x (x^2 + 5x – 4)

Mathematics
1 answer:
AfilCa [17]2 years ago
5 0

The answer is 3x^3+15x^2-12x.

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I need help with math rlly bad
Vinvika [58]

Step-by-step explanation:

what's the question sweetie?

4 0
3 years ago
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Need help on this plzz
Aleksandr [31]
I do believe that it's one of the bisected ones. bisect is the line that splits the middle and D is definitely wrong. So that should narrow it down. So I would go with A or B. Sorry if I didn't help much but it's better than having no clue.
5 0
3 years ago
Which expression can be used to find the surface area of the following rectangular prism?
Iteru [2.4K]
A is the right answer
4 0
3 years ago
A researcher wants to estimate the percentage of all adults that have used the Internet to seek pre-purchase information in the
lara31 [8.8K]

Answer:

The sample size is 1875.

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}}

Sampling error of 0.03.

This means that M = 0.03

99.74% confidence level

So \alpha = 0.0026, z is the value of Z that has a pvalue of 1 - \frac{0.0026}{2} = 0.9987, so Z = 3.

25% of all adults had used the Internet for such a purpose

This means that \pi = 0.25

What is the sample size

The sample size is n. So

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

0.03 = 3\sqrt{\frac{0.25*0.75}{n}}

0.03\sqrt{n} = 3\sqrt{0.25*0.75}

Simplifying by 0.03 both sides

\sqrt{n} = 100\sqrt{0.25*0.75}

(\sqrt{n})^2 = (100\sqrt{0.25*0.75})^2

n = 1875

The sample size is 1875.

7 0
3 years ago
Which ratio is equivalent to 7:3 ???
Bad White [126]

Answer:

14:6 is a ratio that would be equivalent to the ratio given.

I doubled 7 to 14, and 3 to 6. 21:12 or 28:18 could also be correct.

Final answer: 14:6

If there are answer choices that are not any of these ratios, I can help. xD

8 0
3 years ago
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