A physical fitness association is including the mail run in the secondary school fitness test. What type of weather for the boys in the secondary school is known to possess a normal distribution with a mean of 440 seconds and a standard deviation of 60 seconds. Find the probability that a randomly like the boy in secondary school it take longer than 310 seconds to run the mile.

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answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb

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60 for the first and 130 for the second

step-by-step explanation: