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2.3 Exercise 58

Avg difficulty 2.5

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.

  1. ⓐ Give a linear equation for the remaining federal helium reserves, R,R, in terms of t,t, the number of years since 2010.
  2. ⓑ In 2015, what will the helium reserves be?
  3. ⓒ If the rate of depletion doesn’t change, in what year will the Federal Helium Reserve be depleted?

OpenStax Precalculus 2e, 2.3 Modeling with Linear Functions, exercise 58

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Adapted from College Algebra © 2021 Rice University. Licensed under CC BY 4.0. Sources: College Algebra 2e, Algebra and Trigonometry 2e, Precalculus 2e, College Algebra with Corequisite Support 2e. Imported at revision 4922e46.