Question 12 (1 point) Listen Find the derivative. y = = + 2 sec x OALy' = - 2 sec x tan x O B) y' = - , + 2 tan2x O c) y' = - 2 + 2 sec x tan X OD) y'= - 2 - 2 CSC X x2Question 13 (1 point) Listen Evaluate the integral. S dx 8 + 7x O A) $ In|-8-7x | + C O B) In-8- 7x| + C O C) -8 In|-s-7x | + C O D) : In/8 + 7x | + CQuestion 15 (1 point) Listen Find the largest open intervals where the function is concave upward. f(x) = x3 - 3x2 - 4x + 5 O A) None O B) (-00, 1) O C) ( 1, 00 ) O D) ( -00, 1) , (1, 00 )Question 16 (1 point) () Listen Find the limit, if it exists. 1+x-1 lim x-Q X O A) 1/2 O B) 1/4 O C) Does not exist O DJ OQuestion 17 (1 point) () Listen Evaluate the integral. 3e-7x dx O A) 3e- 7x + C O B) - 2e- 7X + C O c) - 3e-7x2 + C O D) - 4e-7 x+1 + CQuestion 14 (1 point) () Listen Use the properties of limits to help decide whether the limit exists. If the limit exists, find its value. lim 5x2 +7x -9 X -00 -6x2+ 2 OA) - O B) - O DIOFind the largest open intervals where the function has the indicated concavity. Concave downward O A) (0, 1) O B) (-00, - 1) O c) (-1, 0 ) O D) ( - 1 , 0) , ( 1 , 00 )