Answer:
Are you sure that it is 54. I have a feeling that it is 64 as that would be 8 if it was 64. If it is 54 you would divide both sides by 54 and that would get you 9.48, which is not one of your answers.
m =9.48148
Explanation:
(54)m = 512
Divide each side by 54
(54)m/54 = 512/54
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