Refer to your work from problems 11‑21 and 11‑26. Homework Help ✎
In problem 11‑21, you found the sums of three pairs of rational numbers. Was each sum a rational number? Justify your answer.
Will that always be true? In other words, is the set of rational numbers closed under addition? Justify your answer. Hint: What is
Yes, each sum was a fraction and therefore a rational number.