Need some help no these. Please indicate which answer. Thank you.

D Question 6 1 pts If f (x) = 2x2 - 9x + 8, what is f' (2)equal to ? 1 O -1 O -2 Question 7 1 pts If f (x) = -}xi + 3x+ + 4, what is the derivative of f(x) equal to ? 0 3xi - 5x- 0 - 3x-7+ 5x4 0 - 2x7 + 5x-+ D Question 8 1 pts If the utility depends only on the consumption of x and u (x) = 4x4 + 2x-7, what is Marginal Utility of X ? In other words, what is the derivative of utility function? 0 -3x 7 - XZ 0 3 x 7 - X-= 0 3x 4 - xi 0 - 3x 7+x-7 Question 9 1 pts If the utility depends only on the consumption of x and u (x) = (2x-? + 3 ) (-4x7 + 2 ), what is Marginal Utility of X ? In other words, what is the derivative of utility function? 0 x 7 ( 2 x 7 + 3) + x2 ( -4x7 + 2) 0 -x7 (2x 7 + 3 - x2 (-4x7 + 2) O x- 4 ( 2x 2 + 3) +x-4 (-4x1 + 2) 0 -x-4 (2x 2 + 3) - x-= (-4x7 + 2) D Question 10 1 pts If f (x) = (4x-3 - 2x3 - 5x + 2)', what is f' (1) equal to? O -69 O 69 O -23 O 23