Did sir isakk newton had used letters for numbers for the first time?

Answer 1

Sir Isaac newton is credited as having invented Calculus. That is a method of using mathematical formulae to calculate difficult unknown measurements, such as the volume of an awkwardly shaped object i.e a Ship. It is possible that others did something similar before. Using 'letters as numbers' may also have been done much earlier. Sir Isaac Newton may be the first person to be 'published' and widely read; that does not make him the first.