Modeling with Linear Functions · Exercise 55
The Federal Helium Reserve held about 16 billion cubic feet of helium in 2010 and is being depleted by about 2.1 billion cubic feet each year.
ⓐ Give a linear equation for the remaining federal helium reserves, in terms of the number of years since 2010.
ⓑ In 2015, what will the helium reserves be?
ⓒ If the rate of depletion doesn’t change, in what year will the Federal Helium Reserve be depleted?
OpenStax, Algebra and Trigonometry 2e · §4.2 Modeling with Linear Functions · Exercise 55
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