Question:
$-\frac{3}{8}+\frac{1}{7}=\frac{1}{7}+\left[\frac{-3}{8}\right]$ is an example to show that
(a) addition of rational numbers is commutative
(b) rational numbers are closed under addition
(c) addition of rational numbers is associative
(d) rational numbers are distributive under addition
Solution:
(a) addition of rational numbers is commutative.
The arrangement of above rational numbers is in the form of Commutative law of addition $[a+b=b+a]$