Question

the sum of the lengths of the diagonals of a rhombus is 22, ae is 2x+1,be is x-2. what is the length of ac.

Answer 1

I hate to just refer you to another site, but the formulas you need are right here in the middle of the page:
http://en.wikipedia.org/wiki/Rhombus

If you get stuck, come back and use the "draw" button below to make a sketch of what you have. I'm a visual learner myself and I need to see it in order to do it in my head, or at least write down what the givens are and try making substitutions.