Use a Graphing Utility to Graph the Function and Then $I ( t ) = - 0.1 t ^ { 2 } + 1.3 t$

question 211

Multiple Choice

Use a graphing utility to graph the function and then answer the question.
-The polynomial function $I ( t ) = - 0.1 t ^ { 2 } + 1.3 t$ represents the yearly income (or loss) from a real estate investment, where t is time in years. After what year does income begin to decline?

• A) 13
• B) 5.5
• C) 8.67
• D) 6.5

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