C if you follow the 6 along the line that has the x , and go up three you will land on C . (6,3) the first one is always x , the second is alway Y (X,Y) remover that the line honing across is x and the line going up and down is Y. they are usually labeled
To know if it's even based on it's prime factorization, check to see if it is a multiple of 2. If it is, it is an even number. If it is not, it is an odd number.