If 3^x*4^y = 59,049 and x – y = 10, then x = ?  Choose the correct choice from the following choices.
A) 10  B) 11  C) 12  D) 13  E) 14

Rationale: "since 59,049 is an odd number , it is not a multiple of 4 . this means that y must equal zero . since x - y = 10 and y = 0 , then x = 10 . the answer is a ."
Answer: A