exam Maths Puzzle Numerical Ability

Please help me solve this polynomial and give me some rules when simplifying polynomials.

(3r^-1s^2t^3)^2/27r^3st^-2

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exam Other Question
Given that the quation of a circle is x^2 + y^2 - 10x +4y + 13 = 0, find its center and its radius Cansomeone please show me how to do this?? Evaluate the expression, log 3^9
a. 1/2
b. 2
c. 6
d. 1