Question

If x is a rational number and y is a rational number than x + y is a rational number.

A)
Always True
B
Sometimes True
C)
Usually True
D)
Never True

Answer 1

A)

Explanation:

The set of rational numbers is closed for all the four operations‚ so x+y‚ x-y‚ x*y and x/y are rational too a rational number can be expressed as a fraction of two integers. so‚ x can be expressed as a/b and y as c/d.