exam Maths Puzzle Numerical Ability

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

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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 A population grows at a rate of 8% per year forever. The population starts at 100. What is the size of the population at the end of year n? ( for any integer n)