The lifetime, in years, of a certain type of fuel cell is a random variable with probability density function 81 f (x) = (x + 3)4 x > 0 0 x ≤ 0 a. what is the probability that a fuel cell lasts more than 3 years? b.

whats the

5+2x=a

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the answer is c.

step-by-step explanation:

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4