Answer and explanation

Correct answer: A. 18

  1. Step 1: Differentiate: , so . Answer: 18. Why not the others: 6: gives the function value. 20: drops the constant term of the derivative. 14: differentiates wrongly.

Practise more Calculus, algebra, series and probability.

Free questions with an explanation for every one, and full timed Stúdentspróf (Iceland) mock tests.