Final answer:
The number (-9,876,543,210) is rational because it can be expressed as a fraction.
Step-by-step explanation:
The number (-9,876,543,210) is rational.
A rational number is a number that can be expressed as a fraction, where the numerator and denominator are integers.
Since (-9,876,543,210) can be written as the fraction -9876543210/1, it is a rational number.