Given point A is not on line m, suppose A is reflected across line m. Which of the following is true?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Standard deviation of 19,29,21,22,23

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