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:
240
Step-by-step explanation:
If you draw a straight line, 12 would meet at 240. Hope this is helpful! You were close but I think you mixed up 240 and 300.
 
        
                    
             
        
        
        
The train will have been traveling for 4 hours 
train A=45,90,135, 180
train B=0,60,120,180
        
                    
             
        
        
        
Answer:
D) 1,2
Step-by-step explanation:
Zeroes of a function are the x-values where y= 0