Weegy: Herigonus, David Hume and Rene Descartes.
Herigonus used symbols such as a3 to indicate a times a times a, although he did not raise the exponent. [ The first raised exponents were used by David Hume in 1636, where he used raised roman numerals (like iii or ix) to show exponents. In 1637, Rene Descartes used positive exponents written in the modern way.
Read more: The Origin of Exponents | eHow.com ]
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