- Solve 2lnx=4?

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An object have a volume of 400 cm3 and is made from a material that has a weight density of 4,000 N/m3. What is the mass of the object? Adipic acid HOOC(CH2)4COOH (mm 146.26g/mol) is used in making nylon. What is the total number of atoms in 1.0g of adipic acid? Does this integral converge or diverge? integrate (sin^2)/sqrt(x) dx from 0 to pi
I think I should use comparison test but not sure to what? Can someone help with the algebra question? PLEASE HELP! For which values of a, b, c is (a, b, c) ∈ span{(1, 2, −1),(1, −1, 2),(1, 0, 1)}?