Two pulleys are connected by a belt. The radii of the pulleys are 6 cm and 21 cm, and the distance between their centers is 30 cm. Find the total length of belt needed to connect the pulleys.

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

step-by-step explanation: hi!

the answer would be  

a.

3: 1

step-by-step explanation: