Why does multiplying two negative numbers equal a positive number?
In: 1210
If you found $10 dollars thats +$10.
If you lost $10 dollars thats -$10.
If someone is ordered to pay you a credit of $10, thats +$10.
If you owe someone a debt of $10, thats -$10.
If someone lost that credit to you, that would be -1*$10 = -$10.
If you lost that $10 debt you owe someone, thats -1*-$10 = $10.
You gained a net of $10.
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