a particle moves along the x-axis (units in cm) its initial position at t=0 sec is x(0)=15. the figure shows the graph of the particle's velocity v(t). the numbers are areas of the enclosed regions.
in the graph 0 to a is 4 under the x-axis, a to b is 5 above the x-axis, b to c is 24 under the x-axis.
what is the particle's displacement between t=0 and t=c?