**A speedboat starts from rest and accelerates at +2.17 m/s2 for 8.51 s. At the end of this time, the boat continues for an additional 7.04 s with an acceleration of +0.490 m/s2. Following this, the boat accelerates at -0.724 m/s2 for 5.37 s. (a) What is the velocity of the boat at t = 20.92 s? (b) Find the total displacement of the boat.**

**Answer:**