book Maths Puzzle Numerical Ability

I need help with subtracting radicals PLEASE!!!!!!
The problem is 5sqrt72-3sqrt48-4sqrt128=

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book Other Question

Jim's weekly pay is two thirds of alica's. together they earn $600 per week. What is each person's weekly pay? (write it step by step) how do you solve this system of equation:
y=-2x^2+8x+27
2x+y=15