- What is the answer to 7/8 - 4/5?

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If 51.5 moles of an ideal gas occupies 36.5 liters at 347 K, what is the pressure of the gas? I need that solution by tomorrow. Could someone help me, please????????????? P(x) = x² - 3x + 9, replace x by 3 and calculate P(3).
P(3) =? Q: A: The electrical conductivity of a substance depends on the ability of the - in it to move.? Can you guys help me ? I don't know how to factor this equation so I can get (a+1)^(n+1) - 1? What is the range of this function Please explain?