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20 January, 12:10

If D varies directly with t and D is 105 when t is 3, find D when t is 8.

35

280

840

+1
Answers (2)
  1. 20 January, 13:24
    0
    280

    Step-by-step explanation:

    Let the variation component be "k"

    D = kt

    When D = 105 and t = 3,

    105 = 3k

    Divide both sides by 3 to get the value of "k"

    105/3 = 3k/3

    k = 35

    When t = 8,

    D = kt

    D = 35 x 8

    D = 280
  2. 20 January, 14:20
    0
    280

    Step-by-step explanation:

    D = kt

    105 = k (3)

    k = 35

    D = 35t

    D = 35 (8) = 280
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