How do i make this x variable positive?

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

What number line represents the solution set for the inequality -1/2 greater than or equal to 4

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.