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

Number of subintervals are $\"\"$ .

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

Sample points to be mid points.

Mid points are $\"\"$ and $\"\"$ .

Riemann sum is

$\"\"$

Riemann sum is $\"\"$ .

Graph:

Graph the function and rectangles using mid points.

$\"\"$

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 $\"\"$ .