Acomplete table with values for x or y that make this equation true: 3x+y=15

Multiplying an even number of negative numbers gives an answer that is choose from:

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics

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