Arrange 6X's and 6 units into groups so that each group is identical to the other group

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

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?

Find the distance between c and d on the number line c=3 and d=11