A graphing calculator is recommended.

Graph the given functions on a common screen. Explain how these graphs are related.

$y=2^x,y=e^x,y=5^x,y={20}^x$

All of these graphs approach $$ as $x-,$ all of them pass through the point $(x,y)=$ and all of them are increasing and approach $$ as $x.$ The larger the base, the $$ the function increases for $x>0,$ and the $$ it approaches $0$ as $x-.$