Home > CALC > Chapter 2 > Lesson 2.2.2 > Problem 2-69
2-69.
Using sigma notation, write a Riemann sum to estimate the area under the function
Since area of a rectangle
Next, find the height of each rectangle. The height is determined by
Finally, use sigma notation to represent the sum of all eight rectangles. Since these are left-endpoint rectangles, the index will start at
Use your calculator to evaluate this sum.