Some definitions:

A function is said to beconcave upon a certain interval if its second derivative is positive on that interval, it is said to beconcave downon the interval if its second derivative is negative on the interval

A function is said to beincreasingon an interval if its first derivative is positive on the interval, it is said to bedecreasingon an interval if its first derivative is negative on the interval

so to do the first question, find the second derivative , then solve to find where it's concave down and solve to find where it is concave up

for the second question, find , solve to find where the function is increasing and solve to find where the function is decreasing

do you understand? if not, ask questions, if yes, do the problems and post your solutions so we can check it

EDIT: Soroban seems to be posting a solution as we speak, so you can check your work against his