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Most of us do not know who "invented" factoring trinomials, many do not even care. Factoring is just one of the axioms that an algebra system establishes. If you really want to know, try searching on Google.
55%
about 1,200 us dollars
There are 88 14ers in the whole US.
There are no ridges on a US Penny or the US Nickel, the edges are smooth.