(1 + 5) + 2 = 2 + (1 + 5) - commutative property of addition
5(2x + 3) = 10x + 15 - distributive property
(2 • x) • 7 = 2 • (x • 7) - associative property of multiplication
(3 • x • 4) = (3 • 4 • x) - commutative property of multiplication
(4 + 2) + 6 = 4 + (2 + 6) - associative property of addition
