Question

solve this equation..pls give log identities used in the explanation
..pls explain.
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Answer 1

Answer:

ln (A/10) = ln (Ae^-t/2)

remove ln on both sides

A/10 = Ae^-t/2

1/10 = e^-t/2

e^t/2 =10

t/2 = log 10

t/2 =1

t = 2

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