exam Maths Puzzle Numerical Ability

please help me
I have 2 problems I would love to see if you could help me with

x4-16 and also 3x2-12y2

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exam Other Question

Solve for x:

(3)/(x) - (1)/(x + 2) = (-2)/(3x + 6) Jim is able to sell a hand-carved statue for $670 which was a 35% profit over his cost. How much did the statue originally cost him?

I need help on what formula to use i though