$\"\"$

\

The function is $\"\"$ and the interval is $\"\"$ .

\

Area of the function is $\"\"$ .

\

Where $\"\"$ .

\

\

Let number of subintervals be $\"\"$ .

\

\

$\"\"$

\

\

Substitute $\"\"$ in $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Apply summation formula $\"\"$ .

\

\

Apply summation formula $\"\"$ .

\

$\"\"$

\

As $\"\"$ , then $\"\"$ .

\

\

$\"\"$

\

$\"\"$

\

Area of the region is between $\"\"$ and $\"\"$ -axis is $\"\"$ sq-units.

\

$\"\"$

\

Graph the region:

\

$\"\"$

\

Area of the region is $\"\"$ sq-units.

\

$\"\"$

\

Area of the region is $\"\"$ sq-units.