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Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

What statement is true? 2x^2-9x+2=-1

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