# Math Help - Riemann Sum 3

1. ## Riemann Sum 3

Use a Riemann sum to approximate the area under the graph of f(x) on the given interval with the selected points as specified.

0 x ≤ 8, n = 4, Midpoint Rectangle Approximation Method

2. Originally Posted by bearej50
Use a Riemann sum to approximate the area under the graph of f(x) on the given interval with the selected points as specified.

0 x ≤ 8, n = 4, Midpoint Rectangle Approximation Method

http://www.mathhelpforum.com/math-he...emann-sum.html

3. I dont see where to go without the f(x)

4. Originally Posted by bearej50
I dont see where to go without the f(x)
you have to approximate the value of a definite integral with no function information at all?

... or do you have a graph of f(x)?

5. If you are not given a formula for f(x) then either get the values off a graph, as skeeter suggested, if you have one, or, if you have no information about f at all, just write your formula in terms of f(1), f(3), f(5), and f(7), leaving those instead of specific values.

6. The answer in the back of the book is 40. I cannot see how to arrive at this answer...

7. Originally Posted by bearej50
The answer in the back of the book is 40. I cannot see how to arrive at this answer...
need to see the graph and your work.