- Solve the differential equation d2y/dx2-4y=4e^-2x?

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Ca has atomic number 20 and atomic weight 40.How many electron,proton and neutron will be there? Simplify by writing the expression with positive exponents. Assume that all variables represent nonzero real numbers.? Are there any ozone generators that can output O6 instead of the usual O3 ozone, and can prove it? Why the deeper south you go down in the US the whiter the people are? How long will pcp stay in my urine if I only took one puff off of a wet cigarette?