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Isolde is stacking books. The stack of books forms a rectangular prism.
Each book is the same size. Isolde knows the area of the base of one book is square inches and each book is inch thick.
The volume of a stack of 9 books is
cubic inches.
Since each book is inch thick, the height of the rectangular prism formed by 9 books is 9 * inch = 9 inches.
Therefore, the volume V of the stack of 9 books is given by V = base area * height = * 9 = cubic inches.
So, the volume of the stack of 9 books is cubic inches.