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3 September, 00:32

C is directly proportional to the square of D and when C=32, D = 4. Find C when D = 3

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Answers (2)
  1. 3 September, 00:33
    0
    Answer: c=18

    Step-by-step explanation:

    C is directly proportional to square of D

    C € D2

    € rep directly proportional

    C=kd2

    K is a constant

    C=32

    D=4

    Substitute

    32=k (4^2)

    32=k (16)

    32=16k

    K=32/16

    K=2

    Since we know our constant k to be 2

    Substitute

    We are looking for c, when d=3

    C=kd2

    C=2 * (3^2)

    C=2*9

    C=18
  2. 3 September, 00:45
    0
    Answer:C=6

    Step-by-step explanation:C directly proportional to D

    C=kD where k=constant

    C=32, D=4*4

    32=k16

    K=32:16

    K=2

    Now D=3 and k=2

    C=kD

    C=2*3

    C=6
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