Express the fraction in the simplest form
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Expressing a fraction in the simplest form means to simplify common factor in the numerator and the denominator.

To do so, let's find the prime factorization of both:

So, we can write the fraction as

We can simplify (i.e. cancel) a factor 2 appearing both in the numerator and denominator. We're left with

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try looking in the very back of the book : )

step-by-step explanation:

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e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation: