Can someone help me with these ?

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

Determine the standard form of the equation of the line that passes through (-2,0) and (8,-5)

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?