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Every time you think or say a positive, whole, or fractioned, number, you use positive rational numbers. You might say that you are 19 years old; or that yor birthday is on January 5th etc.
A line graph because time is a continuous variable
The best way to figure this out would be to use an example. So suppose you had a -20 and divided that by a positive 5. That would give you a -4. Take that -4 and divide it by a -2 which would give you a positive 2 (knowing that two negative numbers cancel out to make a positive number). Thus a negative divided by a positive divided by a negative would give you a positive number.
every time you miss one it becomes -1 on your scorecard in golf and minigolf
In the 3 demensiones we use, some use time as a forth, yes. Even traveling trough a wormhole will make you move even though you end up a place that is farther then what you have actually moved the distance you have moved is still positive.