- Combine like terms: 3m + 4, -5m + 6 and 2m + 3 What's the answer? Please help me?

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Point charges of 5micro and -3micro charge are placed 0.250m apart.If both C are +ve,where can a 3rd C be placed for the net force to be 0? Can anyone solve any of these questions? I think a lot talented here to help me.? Calculus question ! I am struggling to find the equation. Help Please !? Molar mass of Radon if mercury vapor diffuses 1.082 times as fast as radon gas? Assume that Graham's law holds for diffusion.? A photon has a wavelength of 609 nm. Calculate the energy of the photon in joules. Enter your answer in scientific notation.?