Since you haven't provided the graph for this problem, I'll just tell you how to solve it and you can apply the steps on the graph you have.
The change in position can be calculated by calculating the area under the curve in the graph of velocity vs time. Since we are given an initial condition, then we should consider this condition in our calculations as well.
Example:
for t=2:
x = xi + the area under curve from 0 till 2