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Kryger [21]
2 years ago
15

Helppppp plzzzz I will mark brainliestttt

Mathematics
1 answer:
expeople1 [14]2 years ago
8 0

Answer:

it's a. ctxr6irx5ixtxtcycyd TY ibis4dyhugbyrobut

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What point is an x-intercept of the quadratic function f(x)=(x+6)(x-3)
Katyanochek1 [597]
X-intercept is (-6, 0) , (3, 0)

7 0
3 years ago
It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken if the desir
Ksju [112]

Answer:

We need a sample size of at least 75.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, we find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

The standard deviation is the square root of the variance. So:

\sigma = \sqrt{484} = 22

With a .95 probability, the sample size that needs to be taken if the desired margin of error is 5 or less is

We need a sample size of at least n, in which n is found when M = 5. So

M = z*\frac{\sigma}{\sqrt{n}}

5 = 1.96*\frac{22}{\sqrt{n}}

5\sqrt{n} = 43.12

\sqrt{n} = \frac{43.12}{5}

\sqrt{n} = 8.624

(\sqrt{n})^{2} = (8.624)^{2}

n = 74.4

We need a sample size of at least 75.

6 0
3 years ago
Read 2 more answers
Help please ASAP !!!!
mixas84 [53]
Your answer is -4<span>√6. Hope this helps :)</span>
5 0
3 years ago
There are 412 students and 20 teachers taking buses on a trip to a museum. Each bus can seat a maximum of 48. Which inequality g
Vlad1618 [11]

Answer:

Option B. b\geq 9

Step-by-step explanation:

Let

b------> the number of buses

we know that

48b\geq (412+20) -----> inequality that represent the situation

Solve for b

48b\geq 432

b\geq 432/48

b\geq 9

6 0
3 years ago
Read 2 more answers
Rearrange the equation so xxx is the independent variable. 6x+y=4x+11y6x+y=4x+11y
slava [35]

Answer:

10x=10y so x and y are the same or x=y

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
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