\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
A certain radioactive substance loses \(12\pourcent\) of its mass each year. Initially, the sample weighs 200 g.
  1. Determine a model for \(M_n\), the mass (in grams) remaining after \(n\) years.
    \(M_n=\)
  2. Is this an example of exponential decay?
  3. Calculate the mass remaining after 10 years.
    g (round to the nearest integer)