So if you take the derivative of this function, you get (dx/dt)(y) + (dy/dt)(x) + (dx/dt) = 0. Plug in dx/dt, x, and y into the function. (-3)(5) + (2)(dy/dt) + (-3) = 0. Isolate dy/dt. 2dy/dt = 18, so dy/dt = 9.
Answer:
A
Step-by-step explanation:
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Should be D. 2x65=130-20=110