- Use the quadratic formula (or factoring) to solve the equation. x^ 2 + 2x - 63=0?

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A 25.0mL solution containing .60M HCl was titrated with 0.50M NaOH. Calculate the pH before the titration and at equivalence point? If the earth is truly spherical, why do we not feel like we are standing upside down or sideways on the earth? i need answers please.? Differentiate(t) = (cos^3 t+ 3cost +7)^9? What is the partial pressure of N2 in a mixture of N2 and O2 having a total pressure of 1075 torr if the partial pressure of O2 is 720 torr? 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?