Answer and explanation

Correct answer: D. 10, using

  1. Step 1: .
  2. Step 2: Evaluate: .
Answer
10.
Why not the others: Not dividing by 2 gives 20; dividing twice gives 5; using only the upper limit gives a different value, and the lower limit must be subtracted.

Practise more Calculus: Anti-differentiation and Areas Under Curves.

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