exam Maths Puzzle Numerical Ability

Simplify. (Multiply)

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

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exam Other Question

help finding values of x and y in parallelograms PQRS
PT=x+2,TR=y,QT=2x,TS=y+3 how do you find the x and y intersect of a problem that dosent have the formula written already but it is in a word problem? THANK YOU!!!!!

how do you find the point where the