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Why are seeds important in the life cycle of plants? If f(x)=2x+3,g0f(x)=2x-1 find f0g(2)? Show that the expression (x+y)(x-y)-16x+64 may be written as the difference of two squares, and then factor the expression.? Can any electric engineer send me his email please? Does oil increase underground overtime? Ex: If one finds oil, but doesn t dig for 50 years, will there be more oil there or same amount?