Bob has a bookcase with 4 shelves. There are k books on each shelf. Using k, write an expression for

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Bob has a bookcase with 4 shelves. There are k books on each shelf. Using k, write an expression for the total number of books.

Total Books = Bookcases * shelves per bookcase * books per shelf
Total Books = 1 * 4 * k
Total Books = 4k