This depends entirely on what it is. Much of this information is available online. You could try asking a more specific question here or use a search engine.
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His name is Cornelius, and he invented long division (something that every child HATES!)
To find out 77 percent of something, just multiply that something to 0.77.
Precalculus is not something that was invented. It is merely the things about mathematics that you need to know before you can begin the study of calculus.
The number 0 was invented by Aryabhatta who was from Indian (Asian) mathematician.
Rene descartes invented bar graphs you can find more about him in the book."A flyon the celieng."