Question

Consider a function that describes how a particular cars gas mileage depends on its speed. What would be an appropriate domain for this function?

Answer 1

gas mileage = k*s, where k is a constant of proportionality and s is the speed. Unfortunately, this does not take into account the fact that the engine consumes fuel even when the car is not moving.

Here it makes most sense to regard {0, S} as the domain for this function. Here, S would represent the car's top speed.