1. The problem statement, all variables and given/known data The velocity, in ft/sec, of a particle moving along the x-axis is given by the function v(t) = e^t + te^t. What is the average velocity of the particle from time t=0 to time t=3? Answer: 20.086 2. Relevant equations 3. The attempt at a solution Average velocity means the derivative formula, [s(t + Δt) - s(t)] / (Δt) In other words, I get [v(3) - v(0)] / (3-0) [e3 - 3e3] / 3 And I got 26.447 However, the answer is 20.086. What did I do wrong?