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12 March, 11:26

R (t) = 3t

A (r) = pi r^2

find A[r (t) ]

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Answers (1)
  1. 12 March, 13:16
    0
    R (t) = 3t; a (r) = πr²

    subtitute:

    a[r (t) ] = π (3t) ² = 9πt²
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