- What is the correct Lewis structure for boron trifluoride?

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Consider the curve whose equation is (x^4)+(y^4)+3xy=5. The slope of the tangent line dy/dx at the point (1,1) is what? Thanks in advance!? Is this true ?
http://www.newsweek.com/how-will-world-end-another-doomsday-looms-here-what-could-actually-bring-714437? The area of a rectangle is 1260 square inches . its length is 36 inches find the width? Benzenes enthalpy is(ΔHovap) = 30.77 kJ/mol and entropy of vaporization (ΔSovap) = 87.1 J/K mol. Calculate the boiling point of benzene in C? How long would it take for an adult male grizzly bear to subdue an adult human male?