7.13 is "wireyouinsulate" (why are you in so late?) but I don't know about 8.1, sorry.
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1) 21 2) 1 3) -25 4) mean= 81, median=84.5 Final answer= 15730
1 = 3^(0) 3 = 3^(1) 9 = 3^(2) x = 3^(3) 81 = 3^(4) Notice that the indices rise term by term. Hence x = 3^(3) = x = 27
The factors of 18 are 1,2,3,6,9, and 18. The factors of 81 are 1,3,9,27, and 81.
81 is a perfect square because 81 = 9 x 9
81 = square of nine