How did Rene descartes discover the coordinate plene?

What does 75 times -30 equal? What can you do at age 33? What is the square root of mango? How many cars can fit in an area of 26 ft by 9ft? What is 4.22 plus tax? Examples of tautology? What is 1 divided into g equals 5 over 46 what is g? Where does sunlight hit earth at a 90 degree angle? What are some reasons for using a matrix structure? What is .183x2.4? How many verses in the New Testament warn against false teachers? How do you convert 10.68 grams to milligrams? What are the different types of set? What is 3.65 in a fraction? What is 1.3 times 3.04 times 5.46 to the nearest hundredth? Straight line from the center of a circle to the outside diameter is called? What is -83x-5? What is a piece of caca? How many Angstroms are equal to one millimeter? What is 120 diveded by 2?