Question 16 O Mark this question Find the inflection point(s) for the function f(x) = - x* + 5x*+ 12x -2. O (3,0) O (3, 147) O (0, - 2) and (3, 196) O (3, 196)Question 17 O Mark this question Find the second derivative of f(x) = xsinx. O f"(x) =COSx Of"(x) = - 2cosx + xsinx O f"(x) = - COSX Of"(x)=2cosx -xsinxQuestion 18 O Mark this question Using the properties of combinations of continuous functions, determine the interval(s) over which the function f(x) = 5x*vx -18 is continuous. O [- 18, 00) O (-00, 00) O [18, 00) O (- 00, 18]Question 19 0 Mark this question The cost function, C(X), in dollars for producing x units is given by CEO = 0.1 if + 25X + E350- Approximate the cost of producing the 24m unit by using the marginal cost 0 $134190 O $1314.90 Question 20 O Mark this question Find the derivative of f(x) = In 2x5 - 7 Of ( x ) =. 6 X 2x3 - 7 O f'(x) = 6In(x)-In(2x5 -7) Of ( x)=. 6 10x4 + X 2x3 - 7 10x4 Of (x)= 6 X 2x3 - 7