This question cannot be answered without information as to what rxy is.
It is obviously NOT the correlation coefficient between x and y because that cannot be smaller than -1.
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It is: 27 is 1/3 of 81
9*9 = 81 81*10 = 810 so 9*90 = 810 and, therefore, 810/9 = 90
3^4 or 9^2
81; because 92 is 81.
81 years.