### Home > CALC > Chapter 4 > Lesson 4.1.1 > Problem4-11

4-11.

Write a Riemann sum that approximates $A(f, 2 ≤ x ≤ 5)$ with $n$ rectangles for $f(x) = 3x + 5$. Then find the approximate area using at least four different values of $n$. For what value of $n$ is your approximation most accurate and why?

General form of left-endpoint Riemann sum: