'= (x+y=2)², y lod=2 (sety/xu)
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- the number of banks in the country for selected years from 1980 to 2009 is given by y=-383.7x+18,499 where x is the number of years after 1980. If this model is accurate after 2009, in what year would the number of banks be 3918the average monthly bill for wireless subscribers from 1985 to 2008 can be modeled by b(x)--1.217x+97.299, where x is the number of years after 1980. if this model remains valid,l in what year will the average monthly bull be $43.75?express 20 as the sum of two positive numbers such that x^3 + y^2 is as small as possible
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