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e2:
If f(1) = 160 and f(n + 1) = –2f(n), what is f(4)?
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Hero:
Hint: You already know f(1) = 160 so let n = 1. Upon doing so, you'll get the value of f(2). Once you have the value of f(2), use that to find the value of f(3) and so on.
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