Global Apple IPed sales between $2006$ and $2014$ can be modeled as $A(x)=-1\mathrm{.}427x^2+24\mathrm{.}766x-54\mathrm{.}44$ milllon $|$Pods$,$ where $x$ is the number of years since $2000.$

The input notation is $$ and the input units are

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The input description is $.$

The output notation is $$ and the output units are millon iPods $$

The output description is $$

The input interval can be written as $$