Riemann Sum? PLEASE HELP

[nikchic5]

Evaluate the Riemann sum for f(x)= 5 - (x^2), 0 is less than or equal to x which is less than or equal to 2, with four subintervals, taking the sample points to be right endpoints.
Thanks soooo soooo much to anyone who can help me!!!

 

[stapel]

It might be helpful for the tutors if you showed what you've done and where you're stuck. For instance, you've subdivided the interval, as instructed, found the endpoints, evaluated the function at those endpoints, and... then what?

Thank you.

Eliz.