The integral is $\"\"$ .

Here $\"\"$ , $\"\"$ and $\"\"$ .

Graph the area the function of $\"\"$ under given intervals.

(a)

$\"\"$

The above graph consists of two right angle triangles $\"\"$ and $\"\"$ .

$\"\"$ .

$\"\"$

$\"\"$ .

Substitute above results in $\"\"$ .

$\"\"$ .