The function is $\"\"$ , $\"\"$ .

Number of subintervals are $\"\"$ .

Width of the interval is $\"\"$ and $\"\"$ .

Sample points to be right end points.

Right end points are $\"\"$ and $\"\"$ .

Riemann sum is $\"\"$ . $\"\"$

Riemann sum is $\"\"$ .

Graph:

Graph the Riemann sum.

$\"\"$

The Riemann sum represents the sum of the areas of the two rectangles above the $\"\"$ axis minus the sum of the areas of the three rectangles below the $\"\"$ axis.

Riemann sum is net area of the rectangles with respect to $\"\"$ axis.

Riemann sum is $\"\"$ .