- Factor each expression. 9x^2-16?

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I missed a couple geometry classes so I need help with this. Thank you! https://gyazo.com/028718f1750dcb1e8cb96185f18cf272? Can somebody help me differentiate f(x)= (-x^2-1)/(x^2-1)^2 and get the answer as f''(x)= (2x^3 +6x)/(x^2-1)^3? Point P is 6 units from the center of a circle of radius 10 cm. How many different chords of the circle contain P and have integer lengths? How many times can 20 go into 183? Is carbon monoxide poisoning painless?