Chapter 13.4, Problem 11E

(a)

To determine

the area under each curve and above the $\text{x-axis}$ on the interval $\left[0,2\right]$, by two rectangles.

(b)

To determine

the approximate area under each curve and above the x-axis on the interval $\left[0,2\right]$ using four rectangles.

c)

To determine

To: the approximate area under each curve and above the $\text{x-axis}$ on the interval $\left[0,2\right]$ using $40$ rectangles