exam Maths Puzzle Numerical Ability

Hello, would you please help me with this:
1- find center and radius of a circle that has the equation (x-3)^2+(y+5)^2=36

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exam Other Question

dots sells 250 t-shirts for $2.00 and shorts for $4.00. In april total sales were $600.00. How many t-shirts and shorts did dots sell. The lenght of a rectangle is three times its with. If the perimeter of the rectangle is 60, write an wquation to find the dimentions of the rectangle