### Home > CALC > Chapter 3 > Lesson 3.3.3 > Problem3-116

3-116.

For each function below, write and evaluate a Riemann sum to calculate $A(f, −2 ≤ x ≤ 1)$ using $24$ left endpoint rectangles.

General form of a left-endpoint Riemann sum:

1. $f(x) = 2^x$

where $a$ and $b$ are the starting and ending values and $n$ is the number of rectangles.

2. $f ( x ) = \sqrt { x + 2 }$

Refer to the hints in part (a).