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Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

In the geometric progression –3, 12, −48… what term is 3,072?