- Let A be the area of a circle with radius r. If dr/dt=4, find dA/dt when r=3.?

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A farmer rejects 2 out of every 7 apples. If the farmer picks 973 apples, find how many apples were rejected. How do I solve this? Is every second past is like the past ze spend? Na+ S8 Na2S balance? Let f(x) be a function satisfying f'(X)=f(x) and f(0)=2 then ∫f(X)/3+4f(x) dx is? Change from General Conic Form to Standard Form: 137+64y=-y^2-x^2-24x?