- If f(x)=(x-1)/(x+1), x is not equal to -1, then prove that f((x-1)/(x+1))=-1/x?

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Why did the US spacecraft have the US flag with United States written on the craft? What the amount of heat necessary to raise the temperature of 12.0 g of water from 15.4°C to 93.0°C. The specific heat of water = 4.18 J/g°C? The area of the cross section of a building is 124 sq. m. If a model is made using the scale 1:50, whats its crosssectional area in sq. cm? Calculate the number of atoms of each element present in a 5.00 gram sample of the compound K2O? I'm very confused!? Why do some elements have multiple ionic versions?