book Maths Puzzle Numerical Ability

I am having trouble solving this problem. Any help will be greatly appreicated.

square root symbol x-7 - square root symbol x = -1

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How do you calculate slopes in Algebra? i know conners age but i dont really know how to make this question an equation

Nathan has two brothers, Conner and Josh. If we add 2 to Conner�s age, it is exactly � the age of their older brother Josh, who is 12. How old is Conner?