Problema Solution
The transaction volume V (in billions of dollars) of purchases made on a debit cards in the united states can be approximated by the equation V=133.2x+313, where x is the number of years since 2000. In what year was the transaction volume $979,000,000,000?
Answer provided by our tutors
1 billion = 10^9
We need to find x such that V = 979 billions that is:
133.2x + 313 = 979
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click here to see the equation solved for x
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x = 5 years
5 years since 2000 is 2005
In the year of 2005 the transaction volume was 979 billions of dollars.