Which expression illustrates the associative property of addition?
(3 + 19) - 12 = (3 + 12) - 19
3+ (19 - 12) = 3 + (19 +12)
(3 + 19) – 12 = 3 + (19 - 12)
3+ (19-12) = 3 - (19 +12)
done