a. Commutative because the order doesn't matter in addition. Also identity, because the sum on each side is identical.
b. Associative, because we can choose which operation and operands we want to use first. We can also multiply 7 and 3 before multiplying by 2. Also cumulative because 6*7=7*6 and identity because the products on each side of equals are identical.
c. Any number multiplied by zero is reduced to zero. This is the identity property of zero.
d. This is a false equation because the operator on the two sides of the supposed equality are different and the result on each side are different. So none of the properties apply. 27 is not equal to 12.
All equations are true apart from d.