Answer:
60 books in one bookcase
12 books in one shelf
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Step-by-step explanation:
figures is one bookshelf =240/4
figures in each shelf=240/4*5
<ABC = 61 * 2 = 122 degrees
ANSWER
Step 3
EXPLANATION
The given polynomial expression is:

Fatau correctly expanded the parenthesis in the first step.

Fatau also correctly grouped the like terms to obtain:

Fatau committed a mistake at the third step.
Instead of obtaining,

He mistakenly got:
