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sqdancefan

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Answer:

  3

Step-by-step explanation:

The ratio is ...

  f(x+1)/f(x) = (10·3^(x+1))/(10·3^x) = 3^(x+1-x) = 3^1 = 3

The common ratio is 3.

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As you may have noticed, it is the base of the exponential term.