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2 years ago

Evaluate 36 = (x + 9) when x = 3. o A. 3 B. 12 C. 4. D. 21 SUB

Mathematics

2 answers:

murzikaleks [220]2 years ago

4 0

Answer:

$36\div (x+9)$

$x=3$

Substitute x with 3

$\cfrac{36}{3+9}$

$=3$

$\boxed{A)\: 3}$

Allushta [10]2 years ago

3 0

Answer:

Step-by-step explanation:

36 ÷ (x + 9)

=> 36 ÷ (3 + 9)

=> 36 ÷ 12

=> 3

Therefore, 3 is the answer.

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Step-by-step explanation:

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Answer:

See steps below

Step-by-step explanation:

Let X be the random variable that measures the lifespan of a bulb.

If the random variable X is exponentially distributed and X has an average value of 24 month, then its probability density function is

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The probability that the bulb fails the first year is

$\bf P(X\leq 12)=1-e^{-12/24}=1-e^{-0.5}=0.39347$

• If the bulb is in good condition at the end of 18 months, what is the probability that the bulb will be in good condition at the end of 24 months?

Let A and B be the events,

A = “The bulb will last at least 24 months”

B = “The bulb will last at least 18 months”

We want to find P(A | B).

By definition P(A | B) = P(A∩B)P(B)

but B⊂A, so A∩B = B and

$\bf P(A | B) = P(B)P(B) = (P(B))^2$

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