Posted by **REALLY NEED HELP!!!!** on Friday, November 12, 2010 at 6:59pm.

Estimate the area under the graph of

f(x)=3x^3+5

from x=-1 to x=4, first using 5 approximating rectangles and right endpoints, and then improving your estimate using 10 approximating rectangles and right endpoints.

I'm having problem with using the midpoint to find the area. With 5 rectangle I have 210.625 but I can't figure out how to do the 10 rectangle.

- Math: Calculus -
**bobpursley**, Friday, November 12, 2010 at 8:09pm
again, you cannot estimate to six significant digits.

on the five rectangle, right endpoints, use 4,3,2,1,0 as right endpoints, width 1

area= f(4)*1 + f(3)*1 + ...

now for ten, use 4, 3.5, 3, 2.5....to -.5, then area width is .5

## Answer this Question

## Related Questions

- Calculus - Estimate the area under the graph of f(x) = 2x^3 + 3 from x= -1 to x=...
- Calculus - a) Estimate the area under the graph of f(x)=7+4x^2 from x=-1 to x=2...
- Calculus Help Please Urgent!!! - a) Estimate the area under the graph of f(x)=7+...
- calc - a) Estimate the area under the graph of f(x) = 10(sqrt(x)) from x = 0 to ...
- Calculus - Estimate the area under the graph of f(x)= x^2 + 2 x from x=1 to x=5 ...
- Calc - Estimate the area under the graph of f(x)= x^2 + 2 x from x=4 to x=10 ...
- Calculus-Approximate areas - Estimate the area under the graph of f(x)= x^2 + 3 ...
- Math: Calculus - Estimate the area under the graph of f(x)=x^2+2x from x = 4 to ...
- Calculus - Question Details: Do the following. (Round your answers to four ...
- calculus - 4. a. Estimate the area under the graph of f(x)=sqrt(x^2+4) from x=0 ...