exam Maths Puzzle Numerical Ability

I dont get how to do n+(-5).

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exam Other Question

Simplify. (Multiply)

( -5 {{{ (sqrt x + sqrt y) }}} )({{{ sqrt (x-4) sqrt (y)}}} )
Determine which two equations represent perpendicular lines.
(a) y = x - 3
(b) y = 3x -
(c) y = x +
(d) y = x -