Calculus help?

Posted on 2015-10-06 06:45:00 in Math by STEAVE

The question is: An oil tank is to be drained for cleaning. There are V(t) liters of oil left in the tank t minutes after the draining has began, where V(t) = 45 * (60-t)^2

A) Find the average rate, AR (?t), at which oil drains during the time interval: [15 + ?t, 15], if -1 < ?t < 0.
B) Find the average rate, AR (?t) at which oil drains during the time interval: [15, 15 + ?t], if 0 < ?t < 1.
C) Use the result in part e and d to find the limit. lim as ?t approaches 0 of AR (?t)

I'm pretty sure you use lim as h tends to 0 of ((f(x+h)-(f(x))/h but i keep getting the wrong answers for them. Please help!!

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