Question 109030
The number of milligrams of a certian subtance per liter in samples of drinking water all tested within .05 to 40 milligrams per liter. Write this information as an inequality, using absolute value. 
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1st: Find the mid-point between 0.05 and 40: (40+0.05)/2 = 20.025
2nd: Find the distance from the midpoint to an end point:
40-20.025 = 19.975
3rd: Set up the absolute inequality:
|x-20.025|< 19.975

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Cheers,
Stan H.