In a certain chemical, the ratio of zinc to copper is 4 to 11. A jar of the chemical contains copper. How many grams of zinc does it contain?

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

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