At a certain instant, the volume is 480 cm^3, the pressure is 160 kPa, and the pressure is increasing at a rate of 15 kPa/min. At what rate is the volume decreasing at this instant?

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Find the equations of both lines that pass through the point (2, 3) and are tangent to the parabola y = x^2 + x.

I don't really know where to start with these...