In some countries, normal household voltage is 220 volts. It is acceptable for the actual voltage x
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In some countries, normal household voltage is 220 volts. It is acceptable for the actual voltage x to differ from normal by at most 8 volts. A formula that describes this is
|x - 220| ≤ 8
(a) Show that a voltage of 214 volts is acceptable.
(b) Show that a voltage of 209 volts is not acceptable.
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