Respuesta :

Let's solve for each value:

0 - 18 + 12 = -6

12 - (-18) = 12 + 18 = 30

18 + (-12) = 18 - 12 = 6

0 - 12 - 18 = -30

Therefore the greatest value is:

12 - (-18) = 12 + 18 = 30