Add.
(-3x +15)+(3x + 2)

Which expression gives the area of the triangle shown below

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

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?