Approximate the Area Under the Curve and Above The $x$ -Axis Using

Multiple Choice

Approximate the area under the curve and above the $x$ -axis using $n$ rectangles. Let the height of each rectangle be given by the value of the function at the right side of the rectangle.
- $f(x) =2 x^{2}+x+3$ from $x=-2$ to $x=1 ; n=3$

A) 21
B) 17
C) 13
D) 25