book Maths Puzzle Numerical Ability

simplify the square root of 157

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book Other Question

-(49/81)^1/2=?
-(216/125)^2/3

How do you do it? I am doing solving systems by graphing and substitution. The problem is:
5x + 4y = 7
x - 3y = 9
I have to choose the right graph and show how I got the answer. I have no idea