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11 September, 18:18

The function f (r) gives the area of a circle with radius r. It can be written in equation form as f (r) = 3.14r2. What is f (5) ?

A. 28.14

B. 31.40

C. 246.49

D. 78.50

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Answers (1)
  1. 11 September, 21:13
    0
    It is 31.4 because you plug in the function of 5 into r
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