exam Maths Puzzle Numerical Ability

Given square ABCD with AB= 2x+1 and CD= 5x-19 what is the perimeter of the square?

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exam Other Question

I worked this out sqrt(3x+3)- 9 = 0; I came up with x=2 and checking the problem by plugging 2 in, I came up with 81 not = to 9. Can someone advise please? use elimination to solve each system of equations

6s+5t=1
6s-5t=11