7. [-/1 Points] DETAILS WANEFMAC7 10.6.004. Compute f'(a) algebraically for the given value of a. f(x) = -3x + 1; a = -2 f'(a) = Submit Answer 8. [-/1 Points] DETAILS WANEFMAC7 10.6.005. Compute f '(a) algebraically for the given value of a. HINT [See Example 1.] A(x ) = 3x- + x; a=9 f '(a) = Submit Answer 9. [-/1 Points] DETAILS WANEFMAC7 10.6.007.MI. Compute f'(a) algebraically for the given value of a. HINT [See Example 1.] f(x) = 4x - x6; a = -8 f'(a ) = Submit Answer 10. [-/2 Points] DETAILS WANEFMAC7 11.2.003. For the cost function, find the marginal cost at the given production level x. State the units of measurement. 1.] C(x) = 15,000 + 50x + 1,000 * = 100 X Submit Answer [-/2 Points] DETAILS WANEFMAC7 11.2.004