Can you show all of the steps you take to get the answer please

19. Use the quotient rule to find the derivative of the following. y = 9 x- + 2 x +9 dy dx 20. Use the quotient rule to find the derivative of the following. 6x + 1 y = x Choose the correct answer below. O A. 6x - 1 OB. (61X) 2 x1X (6x + 1)2 O C. 81 1 X - 6 OD. X ( x + 1 ) 21X - (Vx ) X 21. Suppose that f(x) and g(x) are differentiable functions such that f(7) = 2, f'(7) = 9, 9(7) = 6, and g'(7) = 5. Find h'(7) when h ( x ) = - f ( x ) g (x ) h' (7 ) = (Simplify your answer.) 22. Find the error in the following work. 2x + 5 Dx 2 _ = (2x + 5)(2x) - (x2 - 1) 2 ( x 2 - 1 ) 2 4x2 + 10x - 2x- + 2 ( x 2 - 1 ) 2 2 x 2 + 10 x + 2 ( x 2 - 1 ) 2 Choose the correct answer below. A. In the first step, the numerator should be (x2 - 1) 2 - (2x + 5)(2x). O B. In the last step, the numerator should be 2x- - 10x + 2. O C. In all three steps, the denominator should be (2x + 5)2. O D. In the first step, the numerator should be (x2 -1) (2x + 5) - (2x) 2