I dont know how the red boxes are incorrect

The figure gives the acceleration of a 3.0 kg particle as an applied force moves it from rest along an x axis from x = 0 to x = 9.0m. The scale of the figure's vertical axis is set by a, = 8.0 m/s2. How much work has the force done on the particle when the particle reaches (a) x = 4.0 m, (b) x = 7.0 m, and (c) x = 9.0 m? What is the particle's speed and direction (give positive answer if the particle moves along x axis in positive direction and negative otherwise) of travel when it reaches (d) x = 4.0m, (e) x = 7.0 m, and (f) x = 9.0 m? (m/s) * (m) (a) Number 94.5 Units (b) Number 67.5 Units (c) Number 27 Units J (d) Number 7.9 Units m/s (e) Number 67 Units 0/s (f) Number 4.2 Units