Formulating a Plan with Formulas

In this chapter, you see how to handle, manipulate, and come to terms with different types of formulas. The mathematical computations must be done correctly, so I cover that here. Plugging values into a formula nets the formula output or result, but you ll also see how to determine what input gave you a particular output. 

Working with a formula requires that you have the formula written accurately, that you know what the symbols in the formula represent (so you can put the right numbers in the right places), and that you do the mathematics correctly. You should also make a prediction or plan ahead so that you have a fairly good idea of what the answer will be. This helps you spot an obvious error in computations, if it occurs. 

Inserting the Values correctly for area and perimeter formulas 

The formula for the area of a rectangle is A = Iw. Interpreting the symbols and operation, this formula says that the area of a rectangle, A, is equal to the product of the length of the rectangle, /, and the width of the rectangle, w. 

The Problem Find the area of a rectangle with a length of 14 inches and a width of 7 inches. 

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