Find the length of UV

Find the value of the cosine for angle a

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

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