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notka56 [123]
3 years ago
12

Find the value of x x=

Mathematics
1 answer:
STatiana [176]3 years ago
4 0

Answer:

x = 4

Step-by-step explanation:

Since BD is an angle bisector then it divides the opposite side into segments that are proportional to the other 2 sides, that is

\frac{BA}{BC} = \frac{AD}{CD} , substitute values

\frac{x}{6} = \frac{2}{3} ( cross- multiply )

3x = 12 ( divide both sides by 3 )

x = 4

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Your question about probability is currently impossible to answer without knowing exactly what the experiment is. Are you picking b,c at random from some interval? Is the choice of either distributed a certain way?

I'll assume the inclusion of "[0,1]" in your question is a suggestion that both b,c are chosen indepently of one another from [0, 1]. Let B,C denote the random variables that take on the values of b,c, respectively. I'll assume B,C are identical and follow the standard uniform distribution, i.e. they each have the same PDF and CDF as below:

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Then the question is to find P(B^2\ge4C). We have

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P\left(C\le\dfrac{B^2}4\right)=P\left(\left(C\le\dfrac{B^2}4\right)\land(B=b)\right)=P\left(C\le\dfrac{B^2}4\mid B=b\right)\cdot P(B=b)

then integrate over all possible values of b.

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