Hello :) I have bubbled-in the first ten questions. If the answer is incorrect please explain why. Thank you for your expertise!

Question 1 of 20 > Let f(x) = x' - 6x2. Then which of the following is the largest interval, of those listed, for which f' (x) > 0 for all x in that interval? O (0, 4) O (-00, 0) O ( 4, 00 ) O (-00,00) O (-00, 0) U (4, 00)\fQuestion 5 of 20 > Let f(x) = ex. Then which of the following is the largest interval, of those listed, for which f'(x) What is the equation of the normal line to the graph of f(x) = 3\\x + 2 at x = 9? Oy= -2x O y = 0.5x - 9 O y - 11 = 0.5(x - 9) O y - 11 = -2(x - 9) O y = 0.5xQuestion 8 of 20 > Let f(x) = sin x - ex. If x E [0, 2x], then f has a horizontal tangent line for each x in O {0} O ( x} O (2x}Question 9 of ID 15 Let x} = 2 cm x + x. if x E [0. 2.4:], then f has a horizontal tangent line fur each x in CHEFg 5 T CH3; 0 {71111 0 {5_z'_ 11: O{ ,'J} Question 10 of 20 What is the equation of the normal line to the graph of f(x) = x - 2x at x = 1? Oy = x Ox=1 Oy= -1 Oytl=x-1 Oy= -x