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Writing functions with exponential decay

Problem

Carbon-14 is an element that loses about 10, percent of its mass every millennium (i.e., 1000 years). A sample of Carbon-14 has 600 grams.
Write a function that gives the sample's mass in grams, S, left parenthesis, t, right parenthesis, t millennia from today.
S, left parenthesis, t, right parenthesis, equals
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