Combine the like terms to create an equivalent expression
-k-(-8k)

-k+8k=7k is the solution

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note: the best i know.

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: