Carbon$-\backslash [14\backslash ]$ is an element which loses $\backslash [10\backslash \%\backslash ]$ of its mass every $\backslash [871\backslash ]$ years. The mass of a sample of carbon$-\backslash [14\backslash ]$ can be modeled by a function, $\backslash [$M$\backslash ],$ which depends on its age, $\backslash [$t$\backslash ]($in years$).$ We measure that the initial mass of a sample of carbon$-\backslash [14\backslash ]$ is $\backslash [960\backslash ]$ grams. Write a function that models the mass of the carbon$-\backslash [14\backslash ]$ sample remaining $\backslash [$t$\backslash ]$ years since the initial measurement.