I’m in a 100 level biophysics course, and for a homework assignment I need to find the scaling exponent based on Kleiber’s Law where B is

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I’m in a 100 level biophysics course, and for a homework assignment I need to find the scaling exponent based on Kleiber’s Law where B is proportional to m to the a power. B is in watts, m is in kg, and a is the scaling exponent. If I have b and m, how can I get a?