Fiona has proved that a function, f(x), is an arithmetic sequence. How did she prove that?
A.She showed that an explicit formula could be created.
B.She showed that a recursive formula could be created.
C.She showed that f(n) ÷ f(n − 1) was a constant ratio.
D.She showed that f(n) − f(n − 1) was a constant difference.

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@ali2x2 @danielheyliger

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