Start from a²+b²=c² and derive with respect to time !
the figure is a right triangle with sides a (base) b (height) and c (hypotenuse.) it says:
c is increasing at a rate of 2 in/min and (db/dt) = 3(da/dt)
at what rate is the length a increasing when a = 3in and b = 4in?
THANKS GUYS!