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Profit is given by the quadratic function P(q). Profit is $0 at q=13 and q=33. Maximal profit is $500. Find an expression for P(q)? Can mass be designated as "negative mass" if it is measurably missing? Considering only the values of β for which sin^2β(tan^2β+1) is defined, what is equivalent? Need to find the solutions to |2x| + y = 1 and x + 2y = -1? Would you be so kind help me please? It's about number theory.. Thank you very much before..?