The number 5.47 with three dots following it indicates a repeating decimal. In this case, the three dots indicate that the 7 in the hundredths place repeats infinitely. Therefore, 5.47... can be expressed as 5.477777... or 5.47 with an infinite number of 7s following.
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It is a repeating decimal. That means 5.4747474747, etc. Dots after a string of numbers mean that they repeat.