n is positive integer
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1 Answer

find the equal...0.9^n=0.0001

n*log(0.9)=log(0.0001)

with base=10, log(0.0001)=-4

n=-4/log(0.9)

n=-4/-0.04575749

n=87.41738131

round down giv anser=87

0.9^87=0.0001044956
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