Answer: 7/3.
- A 7/3
- B 8/3
- C 7/2
- D 3
Correct answer: A. 7/3
Explanation: Integral of x² = x³/3. Evaluate: [8/3] - [1/3] = 7/3.
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.