Originally Posted by

**Snowboarder** So obvieasly the function has or meybe have two horizontal asymptotes. So limits to infinity is 90 and also i think there could be another one which is zero but i'm not so sure. At t=0 f(x) = 90 but on the graph i can see from the left side that curve is going really close to zero. For e^x+5=0 function has not vertical asymptote.

My first question was:

How shall i use limits to determine whether the population will increase without bound. I need to show up working.