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What is half life? What is the density of water mixed with food coloring? What is 162.56 centimeters rounded nearest half unit? Let a=1a=1, b=2b=2 and c=2c=2. Find the measure of angles ∠A∠A, ∠B∠B and ∠C? Why are combustible gas-air mixtures flammable in certain proportions and not flammable in other proportions?