The graph below shows the percentage of people 25 years and older in the US who have completed a Bachelor's Degree over a several year period. Call this function f(t), where t is measured in years since 2006. Percent 29.5 29.0 28.5 28.0 27.5 27.0 26.5 2006 2007 - People 25 Years and Over Who Have Completed a Bachelor's Degree for the United States 2008 2009 2010 a. Explain how you know that this function has an inverse function. 2011 b. Give the domain and range of the inverse function. Find f-¹(27.5)and give a practical interpretation. 2012

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