Evaluate each logarithm without using a calculator. 

1. $\log_749$

   Hint (a):

   $7^?=49$

2. $\log_216$

   Hint (b):

   $2^?=16$

3. $\log_338$

   Hint (c):

   Use the laws of exponents to bring the $8$ down in front. What is left?