Answer:
860.8
Step-by-step explanation:
 
        
             
        
        
        
Given:
The three equations for the three numbers are



To find:
The Pythagorean triple generated by using 4 for x and 1 for y.
Solution:
Substituting x=4 and and y=1 in the given equations, we get



In the same way find b and c.


The third number is



The required Pythagorean triple is 8, 15, and 17.
Therefore, the correct option is C.
 
        
             
        
        
        
Total to pay per autograph= 8.00+13.25=21.25
Number of autographs you can buy = 2(21.25)= 42.5
You can buy two autographs and have a change of 8.25