PLEASE HELP. 15 POINTS.

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

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12