Help for Exercises 69-76 on page 29
Be sure that you understand the formulas. It may help to read the formulas silently or aloud, substituting words for
the variables. For example, the formula A = lw may be read as the area of a rectangle is equal to its length
times its width or even more simply as area is equal to length times width.
If necessary, write each formula in words. Then read each exercise carefully to determine which of the formulas will
help you find the answer. Words or phrases that appear in the problem, especially the units of measurement, may help
you decide which formula to use.
Once you have chosen the formula, substitute the given information and read the resulting expression to be sure it