Question

show that rational numbers are closed under addition and subtraction by taking the numbers 1/7 and -2/3

Answer 1

Answer:

11/21,17/21

Step-by-step explanation:

a)1/7+-2/3=?

3+-14/21

3-(-14) =11

11/21.

b)1/7-2/3=?

3-(-14)/21

3+14=17/21

17/21.