look at the sum of two rational numbers let's say they are two rational numbers x and y. because they're rational, they can be written as a ratio of integers. let x = a/b and y =c/d where a b c and d are integers and b and d do not equal 0. the process for finding the sum x +y in terms x + y are shown. based on this sum and using the closure property of integers, what inclusion can you make about the sum of two rational numbers?explain your answer