book Maths Puzzle Numerical Ability

Can you help me solve this problem: 3,520 ft =_____miles

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book Other Question

What percent of total waste deposited in landfills is household refuse?

these are in million tons

soil 107.6
wood 87.6
concrete 22.5
household refuse 32.7

So I take th what is the exact value of 6cos(-61pie/6) - 2sin(13pie/4)