Chapter R - Review of Basic Concepts - R.2 Real Numbers and Their Properties - R.2 Exercises - Page 19: 13

{$-6, -\frac{12}{4}, 0, 1, 3$}

RECALL: The set of integers is $\left\{..., -3, -2, -1, 0, 1, 2, 3, ...\right\}$. $ -\frac{12}{4} = -3$ Thus, the elements of $A$ that belong to the set of integers are: {$-6, 0, 1, 3$}