- Find values for a and b so that y=ax^3+bx has a local maximum at (1,7)...?

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How to solve this 2nd order differential equation x²(d²y/dx²)+4x(dy/dx)+2y=ln x, x>0
using substitution x=e^u? Write the half reaction for 3Mg(s) + N2(g) = Mg3N2(s)? Which cluster is closer, Hyades or NGC6397? Pls explain how to see this from their HR diagrams. If NGC 6396 is 2kpc away, how far is Hyades? A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would? Why do elements only release certain colors of light and not a continuous spectra?