Sinclair is on a hot-air balloon ride that 12
miles from his house. The wind speed is 4 miles per
hour from the south-west. His hot air balloon ride
lasts for a total of 4 hours.
The horizontal distance d(t) from the hot-air balloon
to Sinclair's house over time, tin hours), can be
approximated by the function d(t) = 4t-2.25 +3.
where time 0 indicates the beginning of the balloon
ride. What domain is reasonable for the function?
Explain.