answer:
2.5 or 2 1/2 
work:
4(joshuas friends)+1(joshua)=5
5×1/2=5/2
5/2= 2.5
 
        
             
        
        
        
Hey the answer to your question is -6.4
        
             
        
        
        
Answer:
no solution
Step-by-step explanation:
 
        
             
        
        
        
The coordinates of the vertices of the  parallelogram, given that s is a units from the origin, Z is b units from the origin, and then length of the base is c units could be the following:
W(b+c, 0), Z(b, 0), S(0, a), T(c,a)