alleryWho first described adding on a number line as walking forward and back?
AJohn Napier
BIsaac Newton
CRene Descartes
DJohn Wallis
Answer & Solution
Correct answer: D. John Wallis
1. The first mention of number-line operations is in a treatise of 1685.
2. John Wallis described addition and subtraction as moving forward and backward.
3. Napier only lined up values, and Descartes did not define a number line.
_Source: Wikipedia, Number line, History_
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