I need help on the right answer for 8 and explanation for 7 and 9

ulator - No Calculator No Calambfor Ill. Multiple Choice: No calculator is permitted. Circle the correct answer for each probl Be sure to fill out the Multiple Choice Answer Page at the back of the Exam. 7. Find f'(x) if f (x) = sin5 3x. (A) f' ( x ) = 5 sin+ 3 x . cos 3 x (B) f'(x) = 60 sin+ 3 x . cos3 3 x (C) f' ( x) = 15 cos4 3x ( f'(x) = 15 sin+ 3x . cos 3 x 5 sin ( 3 X ) . cos ( 3X ) . 3 15 sin 4 ( 3x). cos ( 3x) 8. Let f (x) = Vex + 2x + 3 and let g be the inverse function of f. Given f (0) = 2, what is the value of g'(2)? 0 5( x ) ( 0 , 2 ) ve2+7 ez+2 (B) 7 9( x) (2, 0) - NIW WIP (C) (D) (ex+ 2x+ 3) x= Jet ay + 3 z (ex + 2 ) / 2 X ' = ( ex + ay + 3 ) /2 9. Find f"(x) if f (x) = 3x5 - 6x2. 0 = z ( e y . dy + 2 . dy ) (A) f"(x) = 15x4 - 12x (B) f"(x) = 60x3 - 12 (C) f"(x) = 180x2 (D) f"(x) =3x5 - 12x2 may ( e ) + 2 ) 15x 4- 12x 60 * 3 - 12 0 = Jex + 2x +3 lex + 2 x + 3 = y ex + 2 x + 3 = 42 ex + 2x = yo - 3