Micah went on a 4-hour drive. Part of the drive was on a highway and the rest was on surface streets. He drove at 65 miles per hour on
the highway and 35 miles per hour on the surface streets. If the
expression 65x +35(4-x) gives the total distance he drove, what
does x represent?
A) The number of hours he was driving on the highway
B) The number of hours he was driving on surface streets
C) The number of miles he drove on the highway
D) The number of miles he drove on surface streets