The table lists the number of phones sold in millions in the first 5 years on the market. Find a quadratic function f that models the data. Year 1 2 3 4 5 Units sold 2 10 40 100 180 f(x) = (Use integers or decimals for any numbers in the expression. Round to one decimal place as needed.)
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A quadratic function is in the form of y = ax^2 + bx + c. Show more…
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Cell Phones. The number of cell phones in the United States can be approximated by a quadratic function. In 1996 there were approximately 16 million cell phones, and in 2005 there were approximately 100 million. Let $t$ be the number of years since 1996 The number of cell phones in 1996 is represented by $(0,16),$ and the number in 2005 is $(9,100) .$ Let (0,16) be the vertex. a. Find a quadratic function that represents the number of cell phones. b. Based on this model, how many cell phones will be in use in $2010 ?$
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