Step-by-step explanation:
DA=13.................
 
        
                    
             
        
        
        
I can’t quite see the question. Mind taking a picture of it closer?
        
             
        
        
        
Step-by-step explanation:
given:
$12.50- the price of the tshirts 
40- the tshirts they have sold
$850- the raise they need
solve:
$12.50 × 40 = $500 (the price of tshirts and tshirts they have sold) 
$850 - $500 = $350 (the raise they need and the money they have so far from the 40 tshirts they have sold) 
$350 ÷ $12.50 = 28 (the money they lack and the price of a tshirt) 
answer:
thus, they need to sell 28 more tshirts to have the raise of at least $850
hope this helps, good luck! :)
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
z = 3
2y + z = 1
2y + 3 = 1        {substituting z =3}
2y = 1 -3
2y = -2
y = - 2/2 
y = -1 
2x +3y +2z = 13
2x + 3 * (-1) + 2*3 = 13      { {substituting z =3} and y = -1}
2x -3 + 6 =13
2x + 3 = 13
2x  = 13 - 3
2x= 10
x = 10/2
x = 5