A picture like this http://en.wikipedia.org/wiki/File:Exponential.svg http://en.wikipedia.org/wiki/File:Exponential.svg would help. To rub it in, the x axis sh

A picture like this http://en.wikipedia.org/wiki/File:Exponential.svg http://en.wikipedia.org/wiki/File:Exponential.svg would help. To rub it in, the x axis should go to 20 or so, e.g. http://www.wolframalpha.com/input/?i=2**x+vs.+x**2+%28x+from+0+to+20%29 http://www.wolframalpha.com/input/?i=2**x+vs.+x**2+%28x+from...