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2 years ago

I need help is it A B C or D

Mathematics

2 answers:

Vikentia [17]2 years ago

7 0

The answer is C.

First you calculate the area of the backyard:(3x-5)*(4x-10)=12x^2-50x+50

Then you calculate the swimming pool area: (x+8)*(x-2)=x^2+6x-16

Finally, you substract the swimming pool area from the total backyard area and you get:
11x^2-56x+66 which is C.

JulsSmile [24]2 years ago

5 0

I agree, it's C - here's my method :)

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Step-by-step explanation:

Previous concepts

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Solution to the problem

We assume that we have a fair coin that is $p(Head)=p(Tails)=0.5$

For this case we define the random variable X as "number of heads observed in 20 times". The distribution for X is given by:

$X \sim Binom(n=20, p=0.5)$

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$P(X)=(nCx)(p)^x (1-p)^{n-x}$

Where (nCx) means combinatory and it's given by this formula:

$nCx=\frac{n!}{(n-x)! x!}$

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Answer:

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