In 1980, direct U.S. business investment abroad was about 13.5 billion dollars. From 1980 through 2010, that investment grew at an average annual rate of 11.24%.† (a) Make an exponential model that shows the U.S. direct investment abroad A, in billions of dollars, t years after 1980. A(t) = (b) From 1980, how long did it take (in years) for U.S. investments abroad to double? (Round your answer to two decimal places.) years (c) According to the model, how long would it take (in years) from 2010 for investments abroad to double the level present in 2010? (Round your answer to two decimal places.) years
In 1980, direct U.S. business investment abroad was about 13.5 billion dollars. From 1980 through 2010, that investment grew at an average annual rate of 11.24%.† (a) Make an exponential model that shows the U.S. direct investment abroad A, in billions of dollars, t years after 1980. A(t) = (b) From 1980, how long did it take (in years) for U.S. investments abroad to double? (Round your answer to two decimal places.) years (c) According to the model, how long would it take (in years) from 2010 for investments abroad to double the level present in 2010? (Round your answer to two decimal places.) years
Chapter10: Exponential And Logarithmic Functions
Section10.5: Solve Exponential And Logarithmic Equations
Problem 10.88TI: Researchers recorded that a certain bacteria population declined from 700,000 to 400,000 in 5 hours...
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In 1980, direct U.S. business investment abroad was about 13.5 billion dollars. From 1980 through 2010, that investment grew at an average annual rate of 11.24%.†
(a)
Make an exponential model that shows the U.S. direct investment abroad A, in billions of dollars, t years after 1980.
A(t) =
(b)
From 1980, how long did it take (in years) for U.S. investments abroad to double? (Round your answer to two decimal places.)
years
(c)
According to the model, how long would it take (in years) from 2010 for investments abroad to double the level present in 2010? (Round your answer to two decimal places.)
years
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