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

3-106.

Examine the Riemann sum at right for the area under .

How many rectangles were used?

Notice that the index starts at

and ends at . If the area being approximated is over the interval

, what are the values of?General form of a left endpoint Riemann sum:

is easy to spot in the Riemann sum. Now determine the end value,.Notice that

, so each rectangle has a width of . You already computed how many rectangles there are part (a).