A radioactive isotope has a half-life of 173 days. How much of a sample of 100 grams of the isotope would remain after 732 days?

No. of half-lives = 732/173

Mass remains after 732 days = (100 g) × (1/2)^(732/173) = 5.32 g

n, number of half-lives, = 732 / 173 <<< us a calculator

A = (100g) X (1/2)^n << sub n from above, then use the calculator again

11.81 grams

In my study it at 7 months the half life or any other type of radioactive life remains radioactive just changing from one form to another from the point where the original frequency flashed into multiplying cells by isotopic baby birthing..Radiation is an unknown species of frequency and argumentation opinions rarely agree to any unknown recorded norm