is numbers 5-8 correct?

I recognize you! :D

#5 is correct.

#6 is correct.

#7 is correct.

#8 is wrong as you didn't write the conclusion.

Conclusion: f(x) and g(x) aren't inverses of each other.

You did much better!! #5 - #8 is harder than #1 - #4.

Last time(#1 - #4) you got 1 out of 4 correct and this time(#5 - #8) you got 3 out of 4!! Congrats for the improvement!!