That's why it's a right Riemann sum. And so our approximation of the integral of the absolute value of v of t is going to be the area of these rectangles over here. And so we could write, we could write the integral from zero to 40 of the absolute value of v of t dt is approximately, well it's going to be this first change in time times this height. So this first change in time, this is a change in time of 12 times, so it's going to be 12 times, what's the height? Well v of 12 we knew was 200. v of 12 is 200. So it's going to be 12 times, 12 times 200 plus, okay the height here, or the next interval goes from 12 to 20. So it's going to be eight times.