Andy C. answered • 03/17/18

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Math/Physics Tutor

V = 4/3*pi*"R^3

= 4/3 * pi * (1/2*D)^3

= 4/3 * pi * 1/8 * D^3

= 1/6 * pi * D^3

dV/dt = 1/6 * pi * 3 * D^2 * dD/dt

= 1/2*pi * D^2 * dD/dt

10 = 1/2*pi*20^2 * dD/dt

10 = 1/2*pi*400 * dD/dt

20 = pi * 400 * dD/dt

1/20 = pi * dD/dt

1/(20*pi) = dD/dt

Janelle R.

thank you so much for your help!! :)

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03/18/18

Janelle R.

03/18/18