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**counting monkeys** tomorrow I'll be taking a test on exponential growth, things like the growth rates of bacteria. the basic formula that we're using is Y=a(b)^x/c. I am fine with this on till we start adding negatives to the mix. for example

Y=6(2)^-4/6

I understand that the base(6) is going to be multiplied by the factor(2) and although i partially understand how to punch a fraction for an exponent into the calculator, i don't understand exactly how it works, and when the fraction becomes a negative, my calculator answer dos not come out correct ether.