exam Maths Puzzle Numerical Ability

factor the expression

a^2(b-c)-16b^2(b-c)

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exam Other Question

On Friday 13/25 of the stocks traded on the NY stock Exchange advanced in price. If 1,495 stocks advanced then how many stocks were traded on that day
Would x bef how many stocks were traded
x=13/25x=1,1495 ????
find the domain of 3x/x^2+1