Hi, I am stuck on part of the question:
G(t) = -0.04t^3 + 0.9t^2 + 30 predicts your grade out of 100% on the next calculus test when you study t hours during the week before the test.
How many hours of study required to achieve your maximum grade?
Can someone please help me with this?
I am able to differentiate but am unsure how to solve t. It doesn't fit into quadratic?