Thanks for any help

Question 8 Consider the function dened by the iotmule 100 . th

Question 8 Consider the function defined by the formula 100 x 1 15-xx 2 100 x This function is: if O < x < 10 if 10 20 if 20 < x < 30 A. Concave but not strictly concave B. Strictly concave C. Strictly convex D. Convex but not strictly convex I cannot tell because the second derivative of f (X) cannot be E. Questions 9 and 10 refer to the following monopoly profit function: n - -Q3 +48 x Q2 - 180 800 (0 100) Question 9 Which Of the following is true? A. The total profit function is U-shaped because its second derivative is always positive. B. The total profit function is an inverted-U because its second derivative is always negative. C. The total profit function has two output levels at which marginal profit is equal to zero. D. The total profit function is maximized when the monopolist is producing the maximum level of output possible. E. None of the above is necessarily true.