In general

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84. Collision Course Two planes that are traveling toward each other are 720 miles apart. One plane is traveling 40 miles per hour faster than the other. The planes pass after 0.75 hour. How fast is each plane traveling?

77. More Coins Bobby has been saving quarters and dimes. He opened up his piggy bank and found that it contained 47 coins worth $9.50. Determine how many dimes and quarters were in the piggy bank.

In general, there are diminishing marginal sales of pods as sales of espresso machines exceed $20,000,000-$25,000,000, given the assumptions for the trendline.

x = yearly sales of espresso machines