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

4-11.

Write a Riemann sum that approximates *A*(*f*, 2 ≤ *x* ≤ 5) with *n* rectangles for *f*(*x*) = 3*x* + 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? Homework Help ✎

General form of left-endpoint Riemann sum: