exam Maths Puzzle Numerical Ability

what numbers can not be used and whY?

(x^2 - 4)/(9 - x^2)

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exam Other Question

The cost in dollars of manufacturing w wing nuts is given by the expression 0.07w +13.3. Find the cost when 375 wing nuts are made. What is the average cost to manufacture one wing nut?
square root of p + square root of p+3=3