Carbon-141414 is an element which loses 10\, percent of its mass every 871871871 years. The mass of a sample of carbon-141414 can be modeled by a function, MMM, which depends on its age, ttt (in years). We measure that the initial mass of a sample of carbon-141414 is 960960960 grams. Write a function that models the mass of the carbon-141414 sample remaining ttt years since the initial measurement.