Atruck is rented at $40 per day plus a charge per mile of use. the truck traveled 15 miles in one day, and the total charge was $115. which equation can be used to find the charge x, in dollars, per mile traveled?

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

i think it is c hope that