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How would I solve theses right triangle trig problems? Is someone just as closely related to a half sibling as they are to a cousin? Can you guys explain Why the concentration decrease? How to prove that 1^99+2^99+3^99+4^99 is a multiple of 5 ? A mixure of gases N2, H2. Pressure 1.07 bar. Density 0.5122 kg/m3. Assume the gases are ideal. What is the mole fraction of N2?