Health Total spending S on health care in the United States (in billions of dollars) can b...

Health Total spending S on health care in the United States (in billions of dollars) can be approximated by

where x is the number of years since 1960.* Find the year in which total spending is

(a) $2,351,000,000,000

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(b) $2,650,000,000,000

*Based on data from U.S. Department of Health and Human Services.