Could you please help by showing step by step?

In many engineering uses, the value of "g," the acceleration due to gravity, is taken as a constant. However, g is actually dependent upon the distance from the center of the Earth. A more accurate expression for g is: g = g_0 (R_e/R_e + A)^2 Here, g_0 is the acceleration of gravity at the surface of the Earth, A is the altitude, and R_e is the radius of the Earth, approximately 6,380 kilometers. Assume g_0 = 9.8 meters per second squared. If the value of g is 9 meters per second squared, what is the altitude in units of miles