book Maths Puzzle Numerical Ability

For the expression, the square root of 2x-4
*If x=5, write the reciprocal of the expression in simple radical form with a rational denominator.

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Hi, I really need some help!

Write a quadratic equation with -7 and 5 as its roots.

Thank You!!! find the slope of a line that is parallel to and slope of a line that is perpendicular to : y=8

Thanks a Ton!!