### Home > CALC > Chapter 3 > Lesson 3.3.2 > Problem 3-106

3-106.

Notice that the index starts at 0 and ends at 11.

*a* = 3 is easy to spot in a Riemann sum. Now find the end-value, *b*.

General form of a left-endpoint Riemann sum:

You already computed how many rectangles there are part (a).