Answer: 9.
- A 6
- B 8
- C 9
- D 27
Correct answer: C. 9
Explanation: Area = integral from 0 to 3 of x² dx = [x³/3] = 27/3 - 0 = 9.
The exact area under the curve from a to b (shaded) is approximated by a few rectangles, the Riemann sum idea behind the definite integral.