Question

If p varies directly as the square root of r and p=3.2 when r=4,find p when r=6.5

Answer 1

p = k sqrt r

p^2 = k^2 r

3.2^2 = k^2 (4)
so
k^2 = 3.2^2/4

p^2 = (3.2^2/4)(6.5)

find p^2 and take the square root

Answer 2

2+2

Answer 3

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