Question 465828
This question is basically asking you about two of the properties of logarithms, which I'm going to outline:


When two logarithms with the same base are added, you multiply the numbers: {{{logA + logB = log(AB) }}}


When two logarithms with the same base are subtracted, you divide the numbers: {{{logA - logB = log(A/B)}}}


Note: The base would be the subscript after the word "log"; since it's not there, it's an implied 10.


Anyway...anything that's added will be multiplied, and anything that's subtracted will be divided.  This means you can combine your expression into {{{log((5*10)/2)=log(50/2)=log25}}}...your answer is C.