exam Maths Puzzle Numerical Ability

please help me to solve this:
find the two numbers whose sum is 13 and the sum of whose squares is 145

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I need help with this problem. I do not know where to begin. Can someone please help me. Thank you. This is from a worksheet.


Write a formula for the nth term of the infinite sequence whose nth term is given.


7.) -4,-2,0,2,4... What is the formula to find the sum of the angle measures in a 14-gon?