3 years ago

Expand and simplify (x-5) (x 4)

Mathematics

1 answer:

Gre4nikov [31]3 years ago

3 0

You cant expand -5 but you can expand 4 because 2+2 =4 <span />

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PLEASE HELP ASAP I WILL GIVE BRAINLIEST!!! <3

lesantik [10]

1. 42e+18

That Is the answer for one

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3 years ago

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how many weeks of data must be randomly sampled to estimate the mean weekly sales of a new line of athletic footwear? We want 98

Ber [7]

Answer:

We need to sample at least 37 weeks of data.

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:

$\alpha = \frac{1-0.98}{2} = 0.01$

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 $1-0.01 = 0.99$ , so $z = 2.327$

Now, find the margin of error M as such

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

We want 98% confidence that the sample mean is within $500 of the population mean, and the population standard deviation is known to be $1300

This is at least n weeks, in which n is found when $M = 500, \sigma = 1300$

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

$500 = 2.327*\frac{1300}{\sqrt{n}}$

$500\sqrt{n} = 2.327*1300$

$\sqrt{n} = \frac{2.327*1300}{500}$

$(\sqrt{n})^{2} = (\frac{2.327*1300}{500})^{2}$

$n = 36.6$

Rounding up

We need to sample at least 37 weeks of data.

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3 years ago

Claire's three sons, from oldest to youngest, are Evan, Joel, and Alex. The difference between the ages of Evan and Joel is the

Bess [88]

Joel is 13.
Because if the sum of all there ages added together divided by 3, will give you 13.

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3 years ago

Factor this problem<br> 6x^2-5x-1>0

Greeley [361]

6x^2-5x-1>0

(6x-1)(x+1)

x=1/6 x=-1

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3 years ago

Simpl following 12mn+4m²n-3mn+2m²n

almond37 [142]

Answer:

9m+6m^2n

Step-by-step explanation:

12mn-3mn=9mn

4m^2n+2m^2n=6m^2n

==> 9m+6m^2n

or rewrite as 3m(3+2mn)

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3 years ago

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