## Prealgebra (7th Edition)

$23.2$ million tablet PCs are expected to be sold in 2018.
To find the value of $x$, find the difference of $2018$ and $2000$ $x=2018-2000=18$ $x=18$ Now substitute the value of $x$ into the given equation to find the number of expected tablet PCs (in millions) to be sold in the year 2018. $-1.7x^{2}+49x-308$ $=-1.7(18)^{2}+49(18)-308$ $=-1.7(18\times18)+882-308$ $=-1.7(324)+882-308$ $=-1.7(324)+882-308$ $=-550.8+882-308$ $=331.2-308$ $=23.2$ $23.2$ million tablet PCs are expected to be sold in 2018.