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.
- $f(x) =2 x^{3}-1$ from $x=1$ to $x=6 ; n=5$

A) 825
B) 800
C) 875
D) 850