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ratelena [41]
3 years ago
11

Check all of the possible first steps in factoring a polynomial with four terms.

Mathematics
2 answers:
MrRa [10]3 years ago
6 0

Answer:

1. Factor out a GCF

6. Factor by grouping

Step-by-step explanation:

Correct on Ed

harkovskaia [24]3 years ago
6 0

Answer:

factor out a GCF

factor by grouping

Step-by-step explanation:

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25

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(I will mark brainlest, please help me. I'm just really confused.) (25 POINTS)
Alecsey [184]

Answer:

below

Step-by-step explanation:

for f(x) insert the x into the equation.

example:

f(-6) → -(-6+2)^2

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p: -(-4)^2

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a) Does the Range Rule of Thumb estimate more often underestimate or overestimate the actual standard deviation?
qwelly [4]
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8 0
3 years ago
A Confidence interval is desired for the true average stray-load loss mu (watts) for a certain type of induction motor when the
Vaselesa [24]

Answer:

A sample size of 35 is needed.

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, find the width W as such

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

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

How large must the sample size be if the width of the 95% interval for mu is to be 1.0:

We need to find n for which W = 1.

We have that \sigma^{2} = 9, then \sigma = \sqrt{\sigma^{2}} = \sqrt{9} = 3. So

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

1 = 1.96*\frac{3}{\sqrt{n}}

\sqrt{n} = 1.96*3

(\sqrt{n})^2 = (1.96*3)^{2}

n = 34.57

Rounding up

A sample size of 35 is needed.

3 0
3 years ago
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