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The first time somebody bought or traded something on credit, and said "I'll owe ya the rest."

Q: When were negative numbers invented?

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india

to separate the negative numbers and the positive numbers on a number line

No. Whole numbers are counting numbers and zero.

What do I know about negative numbers? A lot.

We have negative numbers, because if there were no negative numbers, people wouldn't lose profit, they would always gain.

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india

to separate the negative numbers and the positive numbers on a number line

One source says that a Chinese text (Nine Chapters in the Mathematical Arts) from around 200 BC used red rods for positive numbers and black for negative. So the "inventor" must be older than that. European texts up until the Renaissance considered negative numbers as absurd.

The product. Of three negative numbers is negative I hope you can get 100 in your homework

They will be negative numbers as for example -5+(-7) = -12

No. Whole numbers are counting numbers and zero.

The product of three negative numbers is negative.

Where do we see negative numbers

It belongs to the set of negative rational numbers, negative real numbers, fractionall numbers, rational numbers, real numbers.

No, not all negative numbers are rational. There are many negative numbers that are irrational, just like the positive numbers.

Rational numbers can be negative or positive.

What do I know about negative numbers? A lot.