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How many degrees of strog base and strog acid? ~ x + y + z = 3, x² + y² + z² = 5, x³ + y³ + z³ = 7 ➪ x⁴ + y⁴ + z⁴ = ? How much butter is equal to 2 tablespoons of oil? How can i determine crop coefficient of constructed wetland macrophytes? Naphthalene sublimation rate=3*10^-5/min. Volume of room=60m^3. How would I calculate the naphthalene concentration in the air of the room?