exam Maths Puzzle Numerical Ability

What is the answer in standard form and the center and radius of this circle equation?
3x^2+3y^2-18x+6y=18

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exam Other Question

ok i have to solve this equation.

S=2WL+2LH+2WH (solve for L)
Simplify.

(a^22b^-5c^-11/a^15c^-4)^3

Write with positive exponents.