Examine the Riemann sum at right for the area under
How many rectangles were used?
Notice that the index starts at
and ends at 11.
If the area being approximated is over the interval
, what are the values of and ?
General form of a left endpoint Riemann sum:
is easy to spot in the Riemann sum. Now determine the end value, .
, so each rectangle has a width of .
You already computed how many rectangles there are part (a).