Exponential Decay -- Example

Problem:   A radioactive isotope of iodine decays exponentially. There is 50 mg of the element initially, 35 mg after 4 days.

      (a) Find a formula of the form

R(t) = R[0]*exp(-k*t)

       that models the process of decay.

      (b) Find the half-life, t[h] , of the isotope.

Precalculus Tutorials, B. Kaskosz and L. Pakula, 2002.