Answer:
y ≤ 3 or -∞ < y < 3
Step-by-step explanation:
domain exists when y is less than or equal to 3
The associative property of addition is pretty much just any numbers in place of these: a + (b + c) = (a + b) + c. Therefore, your answer would be d) (6 + 1) + 9 = 6 + (1 + 9)
