Kinematics: 1-d motion

A motorcyclist heading east through a small town accelerates at a constant 4.0 m/s^2 after he leaves the city limits. At time t=0, he is 5.0 m east of the city-limits signpost, and he is moving east at 15 m/s.
a. Find his position and velocity at t=2.0 s.
b. Where is he when his speed is 25 m/s?
c. Sketch the graphs of his position, velocity, and acceleration as a function of time.