And then the fourth trapezoid goes from 9 to 10. So if I want to approximate the definite integral part right here, before we divide by 10, I just need to find the area of these 4 trapezoids. So let's do that. The area of this first trapezoid is going to be the base, which is 2, times the average height. The height on the left side of this trapezoid is 66. The height on the right side of this trapezoid is 60. The average height right over here is going to be 63.