Solution .The figure above shows the graph of the function f, defined by for all numbers x. Division does not always come before multiplication. Here are the common sizes of lumber, and their actual sizes. When the board is first rough sawn from the log, it is a true 2x4, but the drying process and planing of the board reduce it to the finished 1.5x3.5 size. 2x4s are not actually 2 inches by 4 inches.
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