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The invention is Quipu..
The Inca's used the quipu to record numbers since they didn't have a form of writing. The quipu is a system of strings and knots used to represent numbers so that the Inca's wouldn't have to write down anything.
As a writing system to record information about the ruler
The foil method in algebra is used to "multiply linear binomials."The FOIL method is used in elementary algebra as a guide for solving algebraic problems.
Simplex method used for maximization, where dual simplex used for minimization.
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Quipus, also spelled khipus or quipu, are knotted cords used by the Inca civilization in South America as a method of record-keeping and communication. The position, color, and type of knots on the strings conveyed information such as numbers, dates, and events.
The invention is Quipu..
wages,rents,interest,profits
the incas used the quipus to keep records
The Inca's used the quipu to record numbers since they didn't have a form of writing. The quipu is a system of strings and knots used to represent numbers so that the Inca's wouldn't have to write down anything.
Because both of civilisation
A Inca Quipu is a string with many knots used to record information as there was no system of writing during the Inca empire. The strings were often colored to represent something.
As a writing system to record information about the ruler
* Quipu or Khipu were recording devices used in the Inca empire. It consisted of coloured spun and plied strings from Illa or Alpaca hair or cotton cords with numeric and values encoded by knots in a base 10 positional system.
They used a group of knotted strings called a quipu. The varying knots in a quipu represented different place values, making it easy to count crops or populations or anything that could be numbered in this way.