3.25+(7.75+4.89) use the associative property to add

What is the upper quartile in the box plot?

How do you write y-10=2 (x-8) in standard form

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?