exam Maths Puzzle Numerical Ability

Can you help me simplify without negative exponents [ x y 5 / x -4 y 2 ] -2

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exam Other Question

Adult tickets for a play cost $20 and child tickets cost $8. If there were 33 people at a performance and the theater collected $468 from ticket sales, how many adults and how many children attended the play? detrmine x so that 800 =b 8 * 10^8 * x^-3/2