One night I put a silver dollar in a slot machine and got back two silver dollars. On the second night, I put these two dollars back in the machine one at a time, and each time two silver dollars came out. This pattern continued through the ninth night, after which I took my winnings and went home.

Guest May 27, 2017

The formula is:  y = 2x

First night:         y = 21  =  2

Second night:    y = 22  =  4

Ninth night:        y = 29  =  512

geno3141  May 27, 2017

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