Hello!

I need some help please with two revision questions.

I read my Calculus book and I did not understand it!

Q1.

Suppose that3<= f ' (x) <= 5for all values ofx. Determine the highest and lowest possible values for the expressionA = f (8) - f (2).

Am I meant to use "MVT" ??

Q2.

For what values of the numbersaandbdoes the functionf(x) = axe^bx²

have the maximum value? Give reasons.f(2) = 1

Sorry this I do not know.