Can you my telling me if is this regular polygon or not regular polygon and tell my plz the name of this polygon

How do you answer this question? (step by step)

Find the value of 1715⋅211.though these numbers aren't quite as nice as the ones from the example or the previous part, the procedure is the same, so this is really no more difficult. give the numerator followed by the denominator, separated by a comma.

Define multiplicative inverse. give an example of a number and its multiplicative inverse.