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4 February, 14:47

D varies directly with t. D is 105 when t is 3 ... Find D when t is 8 ... A] 35. B] 280. C]841

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  1. 4 February, 15:06
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    D = kt

    solve for k when D = 105 and t = 3

    k = 35

    So,

    D = 35t

    when t is 8

    D = (35) (8) = 280
  2. 4 February, 15:12
    0
    If it varies directly, then u can make a proportion.

    105/3 = d/8

    cross multiply

    (3) (d) = (105) (8)

    3d = 840

    d = 840/3

    d = 280 <===
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