(-5xy2 z) (7x 6 y 2 z-3x5 y - 4xz)

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

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?

How far does the wijw nj jh jevh dhhb vte hbhe gvbf5wf bjehn v