Problem 10. (1 point) Concavity and points of inflection. Answer the following questions using the function f(a:) = 3:i:3 + 39:2 60m 24 The second derivative of the given function is f\"(:n) = f has points of inflection that occur at a: = NOTE: if you believe the answer is none type "none". Otherwise, state the values as a comma separated list (if needed). f is concave down on and concave up on NOTE: State the open intervals of concavity as a comma separated list (if needed). Note: You can earn partial credit on this