- System of equations by addition method. 5x-7y=14 -2x+3y=-6?

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Given the formula A = πab, solve for a? What is the new pressure of a gas at 98 kPa that changes from 70°C to 85°C as its volume changes from 5 L to 18 L? It takes me 8 hours to drain a tank of 5400 liters which is the mass flow in kilograms per second? A material that consists of steel bars surrounded by concrete is called - concrete? In this case must "a" and "c" be equal to each other also?. I know that "a+c"must be equal to "b"?