At a car service center, there is a discount of $20 if the service charges are above $100. The total charges before the discount for Jeff's car are $113.61. How much will Jeff have to pay? a).$133.61 b).$ 93.61 c).$ 80

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step-by-step explanation:

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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

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