A. Find the energy equivalence of an electron of m 9.26e-31 kg. Answer in units of J.?

Since m is a form of energy (called rest energy), with its energy given by m*c^2, you need to multiply each of these mes by c^2 (the speed of light squared). The speed of light is 299792458 m/s and 1 J = 1 kg*(m/s)^2. That should do it.