So i have some exercises i simply just can not wrap my head around, they are not hard but for some reason i cannot understand them.

Been doing some tests for school and it shows me the correct results in the end if i get it wrong.

(x+4)/(9x+36) , the result is 1/9 if any1 can make me understand how it's made i would appreciate it.

(6logx^2 + 6log1/x), i answered x^4/x^3 but the correct one is x^6, and i dont get it how.

(e^8x)(e^5x)=68, this one i tried doing it with log_{e}=68 and simplify the final result by 40 but it doesen't get me the correct answer.(0.3246)

I realise this is preaty easy but i just need some help understanding it.

Thank you.