This is a cross section of the design of a bookshelf.
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Hope this helps the answer is 2 1/8 the picture explains how i did it :)
ANSWER
EXPLANATION
From the table the values of x, are on the left and the values of f(x) are on the right.
To find f(-1), we look for the value under f(x) that corresponds to x=-1.
This value is 0.
Therefore