exam Maths Puzzle Numerical Ability

HI, can someone show me how to rationalize the denominator and simplify the following?
5 / 2 radical x - 3 radical y

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exam Other Question

Graph the inequality
3x+y<=5

y=3x+5

Not sure where to go from here Can this equation be simplified any further if so can I see step by step how it is done. t = -64+ the radical of 4288 divided by -32