It is sqrt(7*9) = sqrt(63) = 7.9373, approx.
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7.93 because the square root of (7x9)=7.93...
8.48528
8.48528
10.3923048454
Their geometric mean is:sqrt(42*(1/9)2)=sqrt(16*(1/81))=sqrt(16/81)=4/9-------------------The geometric mean of a set of n terms is equal to the nth root of the product of those n terms. The geometric mean of 4 and 1/9 is sqrt(4*(1/9)) = sqrt(4/9) = 2/3.