Final answer:
The property of operations indicated by each statement includes the Identity Property of Addition, the Commutative Property of Multiplication, the Associative Property of Addition, and the Inverse Property of Addition.
Step-by-step explanation:
The property of operations illustrated by each statement is:
a. Identity Property of Addition: 11.1 + 0 = 11.1
b. Commutative Property of Multiplication: 6(2.7 + 4) = 6(4 + 2.7)
c. Associative Property of Addition: (3 + 1) = 3(3 + 1)
d. Inverse Property of Addition: 18 + (-18) = 0