Explain how to decide whether to use graphing, substitution, or elimination to solve a system of equations.

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

Which choice has the correct steps in graphing the solution set to the following inequality? -45_> 20x-5y

Vertical angles must check all that apply