E= MC2 means that the amount of energy in any matter is equal to the mass of the matter times the speed of light squared. for example, let's say I have an object that has a mass of, say, ten grams. the speed of light is 299,792,458 meters per second. Square that and you have 89,875,517,873,681,760. multiply that by the mass of the object (10g) and you get 898,755,178,736,817,600. energy is measured in joules, so the energy of an object that has a mass of 10g is 898,755,178,736,817,600 joules.
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E=MC^2 the two means that the C at the end of the formula is squared, the 2 is an exponent (meaning that you times C by itself)
w = hf - E
M = mass
E=m*c2