- Through (3,-4) and (0,0)?

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A ball is thrown from the top of a building..? What is the cubic polynomial p satisfying p(x)=2^x for x=0,1,2,3? Does anyone believe in aliens or UFO's or have an experience of their own? Please explain. I am having a hard time grasping some of the concepts and would like a step by step explanation .? One liter of a solution of pH 4 has how many more hydrogen ions (H+) than 1 L of a solution of pH 9?