What is the length of the line segment with endpoints (−3,8) and (7, 8) ?

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Which problem could be  solved  by evaluating the expression  7×(−3)7×-3?

The appalachian trail is a hiking trail that passes through the appalachian mountains. three members of a teen hiking group hiked a section of the trail. the hikers stopped at a rest area and equally shared 3 4 gallon of water. how much water did each person get?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?