It looks to me like you've posted in the correct subforum.
I have a question: what is y in your f(x)?
I'm not sure which sub-board this goes in, so I'm sorry if I chose wrong.
How can you find the sum of all points of an exponential within a certain range? That is:
f(x) = a * x ^ y
I figure the result would be same as the area of the region underneath the curve, above the x-axis, and between the two points (start and end), as highlighted pink in the graph (not included due to errors uploading), but I'm not finding a formula for that either.
This is a problem you would learn how to solve pretty early on in the second semester of calculus (so, after your review of functions, after limits, continuity, and differentiation).
[EDIT]: See below for a correction.
Wow, I was getting something completely different. I want to go back to school. I better go through the rest of these online tutorials before my next problem. I feel like a primitive aborigine with the privilege of being graced by a modern caretaker. Thank you so much.