A = y + 13 + x -3
A = 10 + 13 + 5 - 3
A = 25
B = y² - x² + 24
B = 10² - 5² + 24
B = 99
C = ( y + 5 ) + ( x² - 4 )
C = ( 10 + 5 ) + ( 5² - 4 )
C = 36
