So this is going to be, that over there is 12, and then finally, what is this area? Oh, and we have to be careful. This is below the t-axis and above the graph, so this is going to be a negative 12, and then finally we have this area, which is once again going to be a positive area, it's below the graph and above the t-axis, and so let's see, two times four is eight, times 1.5 is four, so we're going to have plus four. Plus four, and so what do we have? We end up with 4.5 plus four is 8.5 minus 12, so this is going to be equal to, 8.8 minus 12 would be negative four plus five, it is negative 3.5 again. Now why did these two things end up being the same? Well, think about what happened here.