According to question,The number of the senior citizens (65 and over) in the United States in millions n years after1990,s = 0.38n + 31.2……………..(i)The percentage of senior citizens living below the poverty level n years after 1990,p = - 0.25n + 12.2…………(ii)For Case 1We have,Number of years (n) = 10(2000 to 1990)Number of senior citizens in 2000 (s) = ?Now,s = 0.38n + 31.2s = 0.38 * 10 + 31.2s = 3.8 + 31.2s = 35Therefore, there were 35 million senior citizens in the year 2000For Case 2We have,The percentage of senior citizens living under the poverty level (p) = 7%Particular year with 7% poverty level = ?Now,p = - 0.25n + 12.27= - 0.25n + 12.27 + 0.25n = 12.20.25n = 12.2 - 7
0.25n = 5.2n = 5.2/0.25n = 20.8n = 21 (Rounding up)Therefore, afterapproximately 21 years (which is in 2011) the percentage of senior citizens
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Elementary algebra,1920,2000,Poverty in the United States,Year 2000 problem