at the movies a bag of popcorn costs $3.50 and a bottle of mineral water costs $2.75. if Madeline has $18 and bought only 2 bottles of water, how many bags of popcorn can she buy at most

How is working backward similar to solving an equation?

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 average rate of change for the given function drom x=1 to x=2