Answer:
12.4
Step-by-step explanation:
A. Air that is breathed in :)
8-3n
The way you know is 8 is the hidden word....
in there and it say 3 times nathans...
So you will take n and times it bye 3..
by doing 3n so 8-3n is your anwser...
(8+x)^3 < 0
take the cube root
8+x <0
subtract 8
x<-8
Answer x<-8