Mariah has been hired as a receptionist. She is paid a flat rate of $225 each week and earns an additional $11.25 for every hour that she works. If her goal is to make $675 in one week, which equation will help Mariah determine the number of hours she must work?
A.$675 = $225h + $11.25
B .$675 = $11.25h + $225
C.$675 = $225h - $11.25
D. $675 = $11.25h - $225

Question

Mariah has been hired as a receptionist. She is paid a flat rate of $225 each week and earns an additional $11.25 for every hour that she works. If her goal is to make $675 in one week, which equation will help Mariah determine the number of hours she must work? 
A.$675 = $225h + $11.25 
B .$675 = $11.25h + $225
 C.$675 = $225h - $11.25 
D. $675 = $11.25h - $225

btaylor · Answer

you multiply 11.25 by the number of hours because it it 'per hour'. But you don't multiply 225 b/c it is  flat rate. And you add them, because she isn't charged anything. So:
675 = 11.25 h + 25 (B)