Answer:
31 vacuums
Step-by-step explanation:
1800 = 250 + 50v
1800 - 250 = 50v
50v = 1550
v = 1550 / 50
v = 31
He sold 31 vacuums.
 
        
             
        
        
        
(3x+2)  (x-7)
FOIL
first 3x*x  = 3x^2
outer  3x*-7 = -21x
inner = 2*x = 2x
last  2*-7 = -14
add them together  = 3x^2 -21x+2x -14
combine like terms  3x^2 -19x -14
 
        
             
        
        
        
4(m + 2) expanded is 4 x m and 4 x 2
simplified: 4m + 8