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Personal consumption expenditures (in billions of dollars) for several types of recreation from 2012 through 2017 are shown in the table, where is the expenditures on amusement parks and campgrounds, is the expenditures on live entertainment (excluding sports), and is the expenditures on spectator sports.
A model for the data is given by
z = 0.54x - 0.6y + 11.98
Find and .
Plain water penetrates dry, clay-laden soil poorly. When sprinkled on such soil, the water forms beads and will not seep into cracks. Imagine that you are a researcher at a company that makes lawn and garden supplies. You want to create a product that can be applied to lawns with dry clay soils. Your goal is for water that is sprinkled on the soil to mix with the product and, as a result, create a solution that more readily
(a) What property of water must your product affect? Explain your thinking.
(b) What substance might you consider as the main ingredients for your product? Explain your choice.
(c) What would you have to find through research or experimentation to be sure that your product will be effective, safe, and environmentally friendly?
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