Find the intervals on which f(x) is increasing, the intervals on which f(x) is decreasing, and the local extrema. f(x) = - 2x2 - 20x - 20 Select the correct choice below and, if necessary, ll in the answer box to complete your choice. 9:3' A The function is increasing on (Type your answer in interval notation. Type integers or simplified fractions. Use a comma to separate answers as needed.) if} B. The function is never increasing. Select the correct choice below and, if necessary, ll in the answer box to complete your choice. '33 A- The function is decreasing on (Type your answer in interval notation. Type integers or simplified fractions. Use a comma to separate answers as needed.) 1:1- B. The function is never decreasing. Select the correct choice below and, if necessary, ll in the answer boxes to complete your choice. (Type integers or simplified fractions.) -. '5' A- The function has a local minimum f( j = . and no local maximum. Cl 3- The function has a local maximum f( j = and a local minimum f( ) = Li' C- The function has a local maximum f( j , and no local minimum. :- D. The function has no local extrema. A manufacturer incurs the following costs in producing x water ski vests in one day, for 0