Question

A train is traveling 55 miles per hour to a destination that is 330 miles away. The function f(x)=−55x+330 represents the remaining number of miles to the destination after x hours of travel.

What is the practical domain of the function f?

all whole numbers from 0 to 6

all real numbers from 0 to 330

all real numbers from 0 to 6

all multiples of 55 between 0 and 330

Answer 1

It's all real numbers for sure and I think that it might be from 0 to 6, I think! I know for sure that it is all real numbers though.

Answer 2

the domain is the numbers that would satisfy x

since x = the number of hours

it would be all real numbers between 0 and 6