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Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

Place the following steps in order to complete the square and solve the quadratic equation,

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