Question 109753This question is from textbook
: The number of milligrams of a certain substance per liter in samples of drinking water all tested within .05 of 40 milligrams per liter. Write this information as an inequality, using an absolute value.
This question is from textbook
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The number of milligrams of a certain substance per liter in samples of drinking water all tested within .05 of 40 milligrams per liter. Write this information as an inequality, using an absolute value.
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Find the range of the measurements: 40-0.05 = 39.95 mg
Find the mid-point of that range: (40+0.05)/2 = 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
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Cheers,
Stan H.
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