>>That's my daughter's math question. I couldn't solve that... :(
>>
>>f(x/y)=f(x)+f(y)
>>f(10)=1
>>f(10000)=?
>
>There is a web site that will do that for you, but I do not have the URL. Others on this site have the URL and maybe they will post it for you . . .and me :))


http://www.mathway.com/