(Modeling)Solve each problem. See Example.
EXAMPLE Using absolute Value to model Tolerance
In quality control and other applications, we often wish to keep the difference between two quantities within some predetermined amount, called the tolerance.Suppose y = 2x + 1 and we want y to be within 0.01 unit of 4. For what values of x will this be true?
SOLUTION

Reversing these steps shows that keeping x in the interval (1.495, 1.505) ensures that the difference between y and 4 is within 0.01 unit.
Weights of BabiesDr. Tydings has found that, over the years, 95% of the babies he has delivered weighed x pounds, where
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What range of weights corresponds to this inequality?

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