Answer:
A
Step-by-step explanation:
If x is the number of shirts you multiy by 15. 2.25 is the additional cost
or, 2y<7 - 3
or, 2y<4
or, y<4/2
or, y<2
in this set will be real numbers that are both less than 
and greater than 
. But that's not possible, so this set is empty.