Yes, he is correct. The problem states that he had $129.50 and he spent it all on his hiking trip so he has $0.00 left in his bank account.
 
        
             
        
        
        
6x+7y=32 and 2x+5y=16
if you add the two equations you get the first answer and if you subtract the two equations you get the second answer
        
             
        
        
        
Answer:
1/2+1.5 
I think. I'm sorry if I'm wrong
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Well, I'm not sure what you mean but Ptolemy's Theorem gives a relationship between the side lengths and the diagonals of a cyclic quadrilateral; it is the equality case of Ptolemy's Inequality. Ptolemy's Theorem frequently shows up as an intermediate step in problems involving inscribed figures.