What is the domain and range of the function f(t)=7.2t models the average distance f(t) in kilometers that BOB rides his bike over time ,t, in hours?
Domain and range are
Generally, since for every real
However if it is to be a model of a physical process the domain and range could be limited.
The domain of the function as a model of a process would be
The same limitations could be applied to the range. This can be explained in 2 ways:
2) You could also give the same reason as in case of the domain. The distance travelled cannot be negative.