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Solve the laplace transform y"- 2y '+ y = e^-t , y(0)=0, y'(0)=1? How to know if a compound is aromatic by just looking at the formula? CHEMISTRY? Find the Left Riemann Sum that approximates the area under the curve of y=e^(4x) on the interval [0,2] with 8 rectangles.? How often are rain forecasts at least 6 or 7 days in advance ever correct? 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?