Atrain 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