book Maths Puzzle Numerical Ability

Hi,I need help with 2 problems here.

I need to find the value of x

1: log x 361/25 = 2

2:I need to assume that x, y and z are positive numbers, use the properties of log

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book Other Question
Give the center and radius of the cirle.
(x+.5)^2 + (y-6)^2=35 How do you simplify this expression? x^5y^-2