The radius of a circle is 8 centimeters. What is its diameter?

The diameter would be 16.

Step-by-step explanation:

Since the diameter is twice the amount of the radius (d÷2=r) or (rx2=d) the answer would be 16.

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