### Plotting Overlapping Curves

Stupid newbie question!

I want to be able to plot two or more functions on a single graph. For example, I wish to plot ~~x^2 ~~$x^2$ and ~~2^x, ~~$2^x$, say in red and blue, such that a person can readily see, with their eyes, where the two curves intersect.

Unfortunately, I can't figure out how to make this happen. It seems like it would be a common teaching device but how to make it work?

Any assistance welcomed!