Juliet is driving the same direction on a single highway for a road trip. When she starts her trip, she notices that she is at mile marker \( 225 \) and the mile markers are counting up as she drives.
If she is driving \( 75 \) mph, write an equation that represents which mile marker she's at, \( m \) , after h hours of driving.
\( h = 225 m + 75 \)
\( m = 225 h + 75 \)
\( m = 75 h + 225 \)
\( h = 75 m + 225\)