Question

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

0 to 100 miles per hour
0 to 50 miles per gallon
times from 0 to 10 minutes
times from –10 to 10 minutes

Answer 1

"0 to 100 miles per hour."

Reason: the independent variable is speed, so the domain should be a range of speeds (nonnegative, up to the car's practical/max speed). The other choices are units of fuel economy (mpg) or time, not speeds.