exam Maths Puzzle Numerical Ability

Subtract

4x/x-5-
20/x-5

divide
x2-36y^2/5x^2-30xy
divided by (x^2+6xy)

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exam Other Question

Okay here goes nothing..

The sum of the perimeters of two squares is 40 inches. The sum of their areas is 58 square inches. What are the dimensions of the squares? Determine which two equations represent perpendicular lines.
(a) y = 4x - 7
(b) y = x + 7
(c) y = - x + 7
(d) y = x - 7