Please help, prepping for AP exam.

3. A particle moves along a coordinate axis. Its position at time t (sec) is s(t) = ff(x)dx feet, where the graph of f is shown below as line segments and a semicircle. a) What is the particle's position at t =0? b) What is the particle's position at t = 3? c) What is the particle's speed at t = 4? d) Approximately when is the acceleration of the particle positive? Justify your answer. e) At what time during the 15 7 seconds does s have its smallest value? Justify your