exam Maths Puzzle Numerical Ability

Simplify. (Multiply)

( -5 {{{ sqrt x + sqrt y }}} )({{{ sqrt (x-4) sqrt (y)}}} )

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exam Other Question

Find the length of the line segment whose endpoints are (-3, 4) and (5, 4). having a tough time with geometry proof's

given: pqrs is a parrellagram with diagonal qs
line qr and line tw intersect at z

prove ts.zw =sz.qw