AP Calculus Practice Questions March 23, ... Answer 3. D: Examine the values in the table: f(x) increases as x gets larger, which indicates that f′(x), the slope of the function, is positive. This means f′(x)> 0, so eliminate (A) and (B). ... The Week Before the AP Calculus AB Exam. What's Tested on the AP Calculus BC Exam? Calculators on ...