Given R(-2, 5, 8) and S(3, 9, -3) find an ordered triple that represents RS and then find the magnitude of RS

Rewrite the following without an exponent. (5/8)-1

Fiona and her friends are playing a game by guessing where a coin will land when it is randomly dropped inside the square shown below. fiona guesses that the coin is likely to land in the blue area. which explains whether or not fiona is correct and why?

Ineed to know the answer to this algebra question.