Ali's dog weighs 8 times as much as her cat. together, the two pets weigh 54 pounds. how much does ali's dog weigh?

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

What is the interquartile range of this data set? 2, 5, 9, 11, 18, 30, 42, 48, 55, 73, 81

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?