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55. If x is the number of years after 1990, and if y = 138.2x + 97.87, then the expenditures for health care will exceed $4658.5 billion is given by: 138.2 x 97.87 4658.5 138.2 x 4560.63 x 33.0002 33 years after 1990
Therefore, 33 years from 1990 is after 2023. 56. Since "at least" implies greater than
or equal to, B ( x) ≥ 13.44. Thus, 0.057 x + 12.3 ≥ 13.44 0.057 x ≥ 1.14 1.14 0.057 x ≥ 20
x≥
Thus, the percent of blacks is at least 13.44%, 20 years after 1990, on or after the year 2010.
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Section 2.4 119