exam Maths Puzzle Numerical Ability

Graph the equation y= -4x

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Please help...my original problem is: 2(x-5)^2 = 3.

I think the answer is: x= 10 (plus/minus) sq.rt.6 / 2....am I on the right track?

Thank you for your help! An isoscelenes trapezoid has one base 23 inches long, and a height of 8 inches. If the area of the trapezoid is 136 square inches, what is its perimeter?