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January 29, 2015

January 29, 2015

Posted by **Nick** on Sunday, January 30, 2011 at 5:30pm.

- Calculus -
**Damon**, Sunday, January 30, 2011 at 5:55pmx^2+y^2 = 41^2

2 x dx/dt + 2 y dy/dt = 0

dy/dt = -(x/y) dx/dt

when y = 9

x^2 + 81 = 1681

x^2 = 1600

x = 40

so

dy/dy = - (40/9)(4)

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