CPM Homework Help : CALC Problem 4-9

Write a Riemann sum that finds $A(f, −8 ≤ x ≤ 8)$ for $f(x) = 2x^{1/3} + 1$ , using the number of rectangles given below. Then evaluate with the summation feature of your calculator.

$16$ rectangles
Hint (a):
Let's use right endpoint rectangles:

$64$ rectangles
Hint (b):
Let's use midpoint rectangles:
$\displaystyle \sum_{i=1}^{n-1}\Delta xf\left(a+\frac{\Delta x}{2}i\right)$