Rearrange the formula v=u+at

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

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?