The diameter of the smallest circle is 9 cm. The diameter of the middle circle is 15 cm. The diameter of the largest circle is 21 cm. Robin D. Hood throws a dart that sticks in the target. What is the probability that the dart sticks in the gray area of the target?

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step-by-step explanation:

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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