Have you tried 2 Fix64 demos? If they work then you can use FloatToFix64 and Fix64ToFloat functions. Your servo code seams to expect floats so you need to deliver floats to it. Conversion functions will help.
Anyway, if you do not want to complicate and your x > 0, then you can calculate power like this: x^y = exp(y*ln(x))
Anyway, if you do not want to complicate and your x > 0, then you can calculate power like this: x^y = exp(y*ln(x))