Question

Last one will fan and medal!!!

Answer 1

My GUESS is 9x.

Answer 2

Was correct :)

Answer 3

@zepdrix

Answer 4

\(\log_b x + \log_b y = \log_b (xy)\)

Answer 5

Hope we can learn the principles involved here, instead of guessing. ;(

Hint: log x*y = log x + log y

Answer 6

Mathstudent's form is good for any valid base, b; mine is good for base 10. the principles are exactly the same.