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How to work out algebraically: (x+y)^-2 = x^-2(1+y/x)^-2? What is the strength of a magnet and magnitude lines? Which state in the united states has the greatest tangential speed as earth rotates around its axis? How many fields can exist in a vacuum? The volume flow of a river is expressed as 5000 cubic feet per second (cfs). Express the flow in gallons per minute and cubic miles per year?