exam Maths Puzzle Numerical Ability

Simplify

32 sq rt 3 - 50 sq rt 5 - 45 sq rt 8 + 20 sq rt 7

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exam Other Question

can some one help me with this problem

kath earns $445 a week for 40 hours of work and $25 an hour for each hour over 40. how many hours did kathy work if she earned $570 in one week? The area of square is 625 mm^2. Find its side length?