- A curve has the equation y=4/x Find dy/dx????? plz help?

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Calculate the maximum wavelength of light (in nm) required to ionize a single rubidium atom. The first ionization energy of Rb is 403 kJ/mol? What is aqueous liquid(aqueous bromine)? What is 1/sin^2 theta minus 1/tan^2 theta? Solve the given system of equations.
x-y=2
2x-3z=8
2y+z=4? If 2/5 a + 1/3 b = 2 , what is the value of 6a + 5b?