Assuming you mean: E = m c squaredE is energy, m is mass, c is the speed of light.
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The answer depends on what E and m (or Em) represents. Some context might be useful.
C = 100 .
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C = 100
The letter that represent the composite number is letter C.
C typically represents the Roman numeral for 100. In other contexts, C can represent various values, such as the speed of light in physics or the degrees Celsius in temperature measurement.