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What time does the Arc Store open tomorrow?

Is there anyone here who has selected Chemistry 1 at Friday 9am who still has more than that option? My timetable is looking quite horrible at the moment and I would definitely appreciate it if someone selects another time that they are comfortable with. I just at least need to fix my chemistry...

Find the x-coordinate of the point on the curve y = 3x² - 2x - 4 where the tangent is perpendicular to the line 2x - 3y + 7 = 0. Can someone tell me where I did a mistake or if I did the whole thing completely wrong. (dy/dx) = 6x - 2 3y = 2x + 7 y = (2/3)x + (7/3) (6x - 2)(-3/2) = - 1 [(-...

please solve these two equations for me. i keep getting it wrong. 2cosx = 1+secx and cos2x=4sin^2x - 14cos^2x thanks