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**[SOLVED] Question On Displacement -- Velocity-Time Graph**

When calculating displacement, if you have a graph that starts with a non zero velocity, do you calculate the area from zero still, or do you calculate only from where it starts?

For instance, a linear problem with a velocity starting at 20m/s 0s and goes to 30m/s 2s.

Do I go Area=1/2bh=1/2(30m/s-20m/s x 2s-0s)=10m and then.. this is the part, do I calculate the left over rectangle under it even though the velocity started at a non zero number? 20m/s x 2s=40m

40m+10m=50m, or does it just stay with where the linear velocity started (10m)?