exam Maths Puzzle Numerical Ability

i need to find the center, and radius of this circle

x^2+(y-8)^2 = 81

please help

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exam Other Question

-3x^4/2xy^2* 3x^-1/y^-1 Suppose that $5000 is invested at interest rate k, compounded continuously, and grows to $6954.84 in 6 years. a) Find the interest rate. b) write the exponential growth function. c) Find the balance after 10years.