NEWrelated_rates

4tan rates dxdt ddt knowndxdt2kmhr unknownddtwhenx1km

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Unformatted text preview: s
 rates
 unknown
 dA A = xy ⇒ dt 3 dx x= y⇒ 2 dt dx dy = y+x dt dt ⇒ 3 dy = 2 dt known
 dy dA 3 dy dx 3 = y+x = y + x dt dt 2 dt dt 2 Plug
in:

 x=12,
y=3,
dy/dt=4
 ⇒ dA 3 = 8 + 12 4 = 96 cm 2 / sec dt 2 






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