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Would someone help me answer this trigonometry math word problem and show my work for it? Thanks!

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The value of a machine depreciates according to the function f(x) = 20000(1/2)x ,where x is the time in years from the purchase of the machine. What is it's value after 3 years?
You need to compute the value of f(x) when x=3, denoted as f(3).  Just plug in 3 where x appears in f(x) to get the answer.