The $50 off was like a coupon after you brought all your merchandise to the counter, so we have to add it back in to determine the number of shirts. 
$400+$50=$450 original price of shirts
Original price ÷ price per shirt= quantity purchased 
$450 ÷ $15/shirt= 30 shirts purchased
Allison bought 30 shirts. 
Hope this helps! :)
 
        
             
        
        
        
Answer:
Step-by-step explanation:
58 is the answer without tax
so the cost of an adult ticket is 13 dollars
and the kids ticket is 8 dollars
use system of equations to solve this.
58=2x+4y
y=x-4
 
        
             
        
        
        
Answer:
8. False.
11 and 13 are consecutive prime numbers, but 11 + 13 = 24 and 24 isn't prime.
9. True. 
10. True.
11. True
12. False.

13. True.