Answer:
m = 57
Explanation:
If we assume your equation is supposed to be ...
512 = (m +7)^(3/2)
we can raise both sides to the 2/3 power to get ...
512^(2/3) = m +7
64 = m +7
57 = m . . . . . . subtract 7
5.9m questions
7.7m answers