In May, about 451 thousand existing homes were sold in the U.S., and sales were decreasing by 3.4% per month. (a) Create a model for this situation. (Recall that you should define the independent and dependent variables and their units, as well as provide an equation.) (b) If this trend continues, how many existing homes will be sold in the U.S. in October? (Round to the nearest thousand homes.)

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