SOLUTION: The number of miligrams of a certain substance per liter in samples of drinking water all tested within .05 of 40 miligrams per liter. Write this information as an inequality, usin

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: The number of miligrams of a certain substance per liter in samples of drinking water all tested within .05 of 40 miligrams per liter. Write this information as an inequality, usin      Log On


   

Question 178935: The number of miligrams of a certain substance per liter in samples of drinking water all tested within .05 of 40 miligrams per liter. Write this information as an inequality, using absolute value.
Answer by MathLover1(20850) About Me  (Show Source):
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Find the range of the measurements: 40-0.05+=+39.95+mg
Find the mid-point of that range: %2840%2B0.05%29%2F2+=+20.025
Find the distance from the mid-point to an end+point:
40-20.025+=+19.075
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Let x be one of the measures in the proper range:
|x-20.025| < 19.075
This describes all the measurements that are within 19.075 of 20.025.