Q: Where was rational numbers first used?

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A rational number is a number that can be written in the form a/b, where "a" and "b" are integers and b is not equal to zero. For example, whole numbers are rational numbers.

Their count. Two in the first case, one in the second.

All rational numbers are real numbers.

yes * * * * * No. Rational and irrational numbers are two DISJOINT subsets of the real numbers. That is, no rational number is irrational and no irrational is rational.

Irrational numbers can not be expressed as fractions whereas rational numbers can be expressed as fractions

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Rational numbers are used in a hospital setting to prescribe dosage of drugs.

The letter R was used for real numbers. So Q, for quotients was used for rational numbers.

Rational numbers are numbers which can be written in the form p/q where p and q are integers and q > 0. Rationals is often used as an abbreviation to refer to the set of all rational numbers.

A rational number is a number that can be written in the form a/b, where "a" and "b" are integers and b is not equal to zero. For example, whole numbers are rational numbers.

Negative rational numbers are used in the same way that negative whole numbers are used: they are simply the additive inverses of their positive counterparts.

Their count. Two in the first case, one in the second.

Where early humanoids lived - in pre-history. Central Africa, I would guess.

There are no consecutive rational numbers. Between any two rational numbers there are an infinity of rational numbers.

If there are no numbers after the 9 it is rational

Ratios

No. For example, 20.5 is irrational; indeed it was one of the first irrational numbers to be discovered.

No. Rational numbers are numbers that can be written as a fraction. All rational numbers are real.