Students at the college are allowed to work on campus no more than 20 hours per week. The jobs that are available pay different rates, starting from $8.75 an hour. Students can earn a maximum of $320 per week. Write at least two inequalities that could represent the constraints in this situation. Be sure to specify what your variables represent.
a) 8.75h ≤ 320
b) r ≥ 8.75
c) r ⋅ h ≤ 320
d) 20h ≤ 320