Suppose we are filling up a balloon with air. 15 seconds after we begin filling the balloon, the volume of the balloon is 5 cubic inches. After another 5 seconds, the volume increases by 3 cubic inches and then the balloon pops instantly.

Let $V(t)$ give the volume (in cubic inches) of the balloon from when we start inflating it to when it pops, where $t$ is the number of seconds after inflation starts. What are the domain and range?
Domain:
Range:

Hint: