Convert this following fraction to a decimal.

21/40

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

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?

Will mark name all segments skew to bc