Please answer the questions below ASAP, make sure they are right as well. I will highly consider giving you thumbs up

Questions:

Question 1 Which of the following are all the critical numbers of f(x) = (100 -x2) O a) o O b) -10, 0, 10 O c) -10, 10 O d) 10, 0 O e) None of the above Question 2 Iff ( x) = x3 (x2 - 35 ), then fis decreasing on which one of the following intervals? O a) (-0o, - V5) U (v5, 00) O b) ( - 00, 0) U (15, 00 ) O c) ( - V5, 0) U (0, v5) O d) (-V5, 0) O e) (15, 00 )