Question

if d varies directly as t and d=4 when t=9 find d when t=21

Answer 1

Let d be = x


9/4 = 21/x

(9/4)*21 = x

47.25 = x


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Answer 2

Hello friend.......
Here is your answer.......

d/t = 4/9, d/21
so, it vary directly

4/9 = d/21

4 × 21 = 9 × d

d = 4 × 21/9

d = 28/3

I hope, it helps you...

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