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10 May, 05:02

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

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Answers (2)
  1. 10 May, 06:44
    0
    105/3=35

    35*8=280

    so it would be 280.
  2. 10 May, 08:19
    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 <===

    D = kt

    solve for k when D = 105 and t = 3

    k = 35

    So,

    D = 35t

    when t is 8

    D = (35) (8) = 280
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