Answer: 6.
- A 2
- B 4
- C 6
- D 8
Correct answer: C. 6
Explanation: Integral of 2 = 2x. Evaluate from 0 to 3: 2(3) - 2(0) = 6 - 0 = 6.
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.