The record time for running the boston marathon is 2.12 hours at an average speed of 12.5 miles per hour. what distance does the boston marathon approximately cover?

answer: 26.5

step-by-step explanation:

a

step-by-step explanation:

hello from mrbilldoesmath!

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