Question

Without calculating, how do you know that the sum 2/21+3/31 is rational?


a. The sum of any two positive numbers is rational



b. When adding fractions, the sum of two fractions is rational so long as both fractions are fully reduced


c. Rational numbers are closed under addition, meaning that the sum of rational numbers is rational



d. When adding fractions, the sum of two fractions is rational so long as both fractions are less than 1​

Answer 1

Answer:

Rational numbers are closed under addition, meaning that the sum of rational numbers is rational