exam Maths Puzzle Numerical Ability

Multiply:
((x^2+x-12)/(x^2-x-20))X((x^2+2x-35)/(x^2+9x+14))

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exam Other Question

Why does y=3 represent a function, but x=3 does not? Write an equation of the line with the given slope and y intercept....please help me because i am lost........m=0;(0,5)