Select all of the scales that are equivalent to 3 cm to 4 km. 0.75 cm to 1 km
1 cm to 3/4 km
6 km to 8 cm
7.5 to 10 km

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