Answer:
20.32 centimeters
Explanation:
The formula here as it says on the problem is 2.54i = c
You want to know how many centimeters wide is the textbook and you already have the wide in inches which is 8:
Then :
2.54 * i = c
2.54 * 8 = c
20.32 = c
The textbook is 20.32 centimeters wide