Solve.A copper base for a lamp consists of a large circle of radius 3y inches with a cut-out area in the center of radius x inches. Write an expression for the area of the top of this copper base. Write your answer in factored form.
A. A = 9?(y + x)(y - x) in.2
B. A = 9?(y + x)2 in.2
C. A = (3y + x)(3y - x) in.2
D. A = ?(3y + x)(3y - x) in.2
Answer: D
Mathematics
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