300
Proof that loga(b)=1/logb(a) with reasoning.
What is 1. loga(b)=x, given. 2. logb(a)*loga(b)=xlogb(a), mult. POE. 3. loga(a)=xlogb(a), product of 2 logs property. 4. 1=xlogb(a), def. of a log. 5. x=1/logb(a), division POE. 6. loga(b)=1/logb(a), substitution.