Find the smaller of 2 consecutive numbers if the sum of the smaller and twice the larger is -4

Twelve friends shared 8 small pizzas equally.how many pizzas did each person get?

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

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?