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In this case must "a" and "c" be equal to each other also?. I know that "a+c"must be equal to "b"? 5 adjacent parking spots. Two cars are parking. What is the probability they park next to each other? Is the sky actually up? Is power use a useful way to measure by which to compare appliances, and if so why? It takes me 8 hours to drain a tank of 5400 liters which is the mass flow in kilograms per second?