Can someone please explain it to me ASAP?!!! This is velocity and net changes

0, a train approaching a station begins decelerating from a speed of 160 mi/hr according to the acceleration function a(t) = - 1280(1 + 4t) - mi/hr2, where t2 0. How far does the train travel between 1? Between t = 0.1 and t = 0.4? .. .. . ween t = 0 and t = 0.1 the train travels mi. und to three decimal places as needed.)