mean = (4 + 81)/2 = 85/2 = 42.5
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The geometric mean of 9 and 81 is 27.0
geo. mean=√(49x81)=7x9=63
Just use the definition of geometric mean. Multiply the two numbers, then take the square root of the result. (To take the geometric mean of three numbers, multiply all of them, then take the cubic root, etc.)
4.0
a = -4 r = -3