Answer:
4
Step-by-step explanation:
just guessing hh oop sorry if its wrong
Answer:
C
Step-by-step explanation:
Once

We know that 
There are infinity values for
, but considering 
Below we have all the solutions for 
Negative:

Positives:

We can see that 
Answer:
4:7 i think, bc its books to pencils so books go first, which is 4, put the ratio sign, then 7