Question 4 (1 point) Using the first derivative test f (a ) = a 3 (x2 - 70 ) has local minimum number(s) at O a) v10 O b) (0, V10) Oc -V10 O d) co O e) None of the aboveQuestion 3 (1 point) If f (a) = 23 (x2 - 49 ), then fis increasing on which one of the following intervals? O a) (-00, - V/7) U (V7, 00) O b) (-00, 0) U (17, 00 ) O c) (- V7, 0) U (0, V7) O d) (-V7, 0) O e) (17, 00 )