Finding work and velocity through acceleration

1. The problem statement, all variables and given/known data
Figure 7-39 gives the acceleration of a 1.95 kg particle as it is moved from rest along an x axis by an applied force Fa, from x = 0 to x = 9 m.

Fig. 7-39 : http://www.webassign.net/hrw/W0128-N.jpg

How much work has the force done on the particle when the particle reaches the following points?
(a) x = 4 m
(b) x = 7 m
(c) x = 9 m

What is the particle's speed and direction of travel when it reaches each of the following points?
(a) x = 4 m
(b) x = 7 m
(c) x = 9 m


2. Relevant equations
F=ma
W=integral (F dot dx)


3. The attempt at a solution
I tried taking the area of the acceleration vs. x graph and timed it by m, which would give me the acceleration of the F vs. x graph, which should be equal to work, but it was incorrect.
I did not know how to find work for the specific position.