Please help me with these questions!

9. [-/1 Points] DETAILS LARCALC11 2.1.067. Evaluate f(4) and f(4.1) and use the results to approximate f '(4). (Round your answer to one decimal place.) f( x ) = x(8 - x) F ' ( 4 ) ~ Need Help? Read It Watch It 10. [-/1 Points] DETAILS LARCALC11 2.1.069.MI. Use the alternative form of the derivative to find the derivative at x = c (if it exists). (If the derivative does not exist at c, enter UNDEFINED.) f( x ) = x3 + 2x2+ 7, c=-2 F' ( - 2 ) = Need Help? Read It Watch It Master It 11. [-/1 Points] DETAILS LARCALC11 2.1.078. Describe the x-values at which the function is differentiable. (Enter your answer using interval notation.) Y= - 368. [-/1 Points] DETAILS LARCALC11 2.1.059.MI. Identify a function f that has the given characteristics. Then sketch the function. f(3) = 9 f ' ( x) = 2, - 0