Answer:
total books in library = 39
books bought from yard sale = ??
Total book in library now = 84
Now,
books bought from yard sale= 39-84
= 45
Answer:
21
Step-by-step explanation:
From the given statements, we know that 
Therefore, substituting this in, we have

All percents are not whole. And no whole number can be rational, because a ration is a piece of, not a whole. I hope this helped!
A. +27
B. +4
C.+21
A. -16
B. 23
C. 3
D. -70
E. -20
Answer: it’s 13
because 13-7-5= 1
12-5-7=0 which is invalid
7-5-2=0 which is invalid
7-5-3=-1 which is invalid