Mathematics, 08.04.2020 19:03, Hazard970

A scientist measures the initial amount of Carbon-14 in a substance to be 25 grams.
The relationship between A, the amount of Carbon-14 remaining in that substance, in grams, and t, the elapsed
time, in years, since the initial measurement is modeled by the following equation.
A= 25e -0.000124t
In how many years will the substance contain exactly 20 grams(g) of Carbon-14?
Give an exact answer expressed as a natural logarithm.
years
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