CPM Homework Help : APCALC Problem 3-116

For each function below, write and evaluate a Riemann sum to calculate the area under the curve for $–2 ≤ x ≤ 1$ using $24$ left endpoint rectangles.

Hint:

General form of a left-endpoint Riemann sum:

$\displaystyle \sum_{i=0}^{n-1}\Delta xf(a+\Delta xi)$

$f(x) = 2^x$
Hint (a):
width of rectangle $=\Delta x=\frac{b-a}{n}$
where $a$ and $b$ are the starting and ending values and $n$ is the number of rectangles.