exam Maths Puzzle Numerical Ability

REALLY HARD TO EXPLAIN please help ,.... write in exponential form and simplify
(the little 3)sqrt x^2y

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exam Other Question

solve and write interval notation for the solution set. Then graph the solution

-3 less than or equal to 3x + 1 less than or equal to 5
The volume V of a gas varies inversely as the pressure P on it. The volume of a gas in 240 cm^3 under a pressure of 23kg/cm^2. What will be its volume under a pressure of 30kg/cm^2?