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anyanavicka [17]
3 years ago
10

The expanded fom of (a-b)²​

Mathematics
2 answers:
Alexxandr [17]3 years ago
6 0
-2ab-b^
Hope it helps ur question
emmainna [20.7K]3 years ago
4 0

Answer:

Step-by-step explanation:

(a-b)^{2} = a^{2} - 2ab + b^{2}

Hope this helps

plz mark as brainliest!!!!!

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Find the size of each of two samples (assume that they are of equal size) needed to estimate the difference between the proporti
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Answer:

The sample size n = 4225

Step-by-step explanation:

We will use maximum error formula = \frac{z_{a} S.D}{\sqrt{n} }

but we will find sample size "n"

\sqrt{n}  = \frac{z_{a} S.D}{maximum error}

Squaring on both sides , we get

n  = (\frac{z_{a} S.D}{maximum error})^2

Given 99% confidence interval (z value) = 2.56

given maximum error = 0.02

n  = (\frac{z_{a} p(1-p)}{maximum error})^2

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on simplification , we get n = 4225

<u>Conclusion</u>:

The sample size of two samples is  n = 4225

<u>verification</u>:-

We will use maximum error formula = \frac{z_{a} S.D}{\sqrt{n} } = \frac{2.56 1/2}{\ \sqrt{4225} }  = 0.0196

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4 0
3 years ago
For a recent year, the rate of first-class postage is as follows:
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Answer:

$0.95

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Given that weight of the function = x

Given that cost of the postage for mail having weight less than or equal to 1 oz = $0.44

then to find the equation can be written as

C(x)=0.44  where 0<x<=1

Similarly we can write equation for other parts

C(x)=0.61  where 1<x<=2

C(x)=0.78  where 2<x<=3

C(x)=0.95  where 3<x<=3.5

Now we can write them together as piecewise function as shown in below:

C(x)=\left\{\begin{matrix}0.44 & 0

to graph that we just draw horizontal lines for each as none equation contains x on the right side .

3.48 oz is less that 3.5 so we will use $0.95.


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2 years ago
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