Answer:
There are 1012 books per bookcase
Step-by-step explanation:
To find the number of books per bookcase take the number of bookcases (72) divided by the number of books (72,864)
So;
72,864 / 72 = 1012
Hope this helps!
Answer:

Step-by-step explanation:
By logarithm rules

I dont know exactly what it is
80÷12= 6 2/3
12×12×12×12×12×12=72
so 12 goes into 80 evenly 6 times, but there is a remainder so you have to include it
80-72=8
so that leaves you with 8/12 which is 2/3 when simplified
now you have 6 + 2/3 = 6 2/3