So this was the last interval we did. The next interval is going to be that. And then the height, we use the right hand side to define the height. 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?