The last equation is the most suitable one to be solved by completing the square .
Answer:
the answer is 12
Step-by-step explanation:

18 because 2X=45 and that technically equals 18 your welcome
Answer:
b≤-23
Step-by-step explanation:
72≥b+95 Move terms
-b≥95-72 subtract
-b≥23
Answer:
20
Step-by-step explanation:
Number of paperback books = 4
Percentage of total books that were paperbacks = 20%
Let total number of books = x
Hence,
20% of total books = paperback books
20% of x = 4
0.2 * x = 4
0.2x = 4
0.2x / 0.2 = 4 / 0.2
x = 20
Total number of books = 20