I decided to make a new thread just because the other one said "linear stuff" and this no longer fits in that.

I was just looking at y=2^x (I have no idea how to superscript x, help?) and then I started to draw a graph in my head and I noticed that when x is negative y is almost but not quite zero, and it gets closer to zero as I go further in the -x direction, but does it ever reach zero? Is this what you call a limit? As in: as x tends to -infinite, y tends to zero or something?

Also, how can I solve for x, I mean, turn it from y=a^x to x=something?