(c) which interval gives a larger average rate of change, [40, 50] or [40, 80]? [40, 50] [40, 80] correct: your answer is correct. (d) compute f(40) − f(0) 40 − 0 . -15/3 incorrect: your answer is incorrect. what does this value represent geometrically? the slope of the line segment from (0, f(0)) to (40, f(40)) the slope of the tangent line at (0, f(0)) the slope of the tangent line at (20, f(20)) the slope of the tangent line at (40, f(40)) correct: your answer is correct. need ? read it