Algebra-1

The expression that results in a rational number is: 3.4 – 8.4. 3.4 – 8.4 = -5, it is a rational number because it can be expressed as the fraction -5/1.

Option A: 3 + 6.456984511…, 6.456984511…appears to be a non-repeating, non-terminating decimal, which indicates it is an irrational number. Adding an integer to an irrational number results in an irrational number.