Problema Solution

find the nearest integer value for n if 3.2(1-.8^n)/1-.8 is approximately 15

Answer provided by our tutors

by solving 3.2(1-0.8^n)/(1-0.8) = 15


we get:


3.2*0.8^n = 0.2


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0.8^n = 0.2/3.2


n log(0.8) = log(0.2/3.2)


n = 12.43


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