In some countries, normal household voltage is 220 volts.
Chapter 0, Problem 144(choose chapter or problem)
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 0 x - 220 0 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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