The following exercise poses a question that can be ansvered by solving an equation. Give the appropriate equation. Note that you are not asked to solve the equation. Argon-39 is a radioactive isotope...

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Extracted text: The following exercise poses a question that can be ansvered by solving an equation. Give the appropriate equation. Note that you are not asked to solve the equation. Argon-39 is a radioactive isotope of argon. Initially a sample of argon-39 contains 10 grams, and the amount remaining after t years is given by A = 10 x 0.5/269 grams. The half-life is the time required for the amount of argon-39 to be reduced by half. The half-life of argon-39 is the solution of an equation. Find that equation.