Two cars left an intersection at the same time, one heading south and one heading east. After one hour they were exactly 100 miles apart. The car that headed east had gone 20 miles farther than the car headed south. How far had the car going east traveled?

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?

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