That would be  5(3w + 13)
The GCF is 5
        
             
        
        
        
I think this is a least common multiple question
So they would all arrive on day 504, (which probably is a few years)
8 = 2 × 2 × 2
18 = 2 × 3 × 3
21 = 3 × 7
I might be right I might be wrong, IM not positively sure but yknow
 
        
             
        
        
        
Volume = l x w x h
 180 = l (5 x 4)
 180 = 20 l
 6 = l
That means that the couch will fit, because the length of the van is 6 ft, which is also the length of the couch.
        
             
        
        
        
The answer is 16in.
Let the radius and height of cylinder A be Ra and Hb respectively and the radius and height of cylinder B be Rb and Hb respectively.
Using similar shapes:
Ra/Ha= Rb/Hb
5.6/Ha=1.4/4
Ha=(4×5.6)/1.4
Ha=22.4/1.4
Ha=16in