11. A customer purchases a stroller and packs of diapers from a store. The table shows the total cost, in dollars, based on the number of packs of diapers purchased, x.
Packs of Diapers 2
Total Cost (in dollars) $450
6 10
$550 $650
Which function models the relationship between the number of packs of diapers, x, and the
total cost, f(x)?
A f(x) = 25x + 400
B f(x) = 25x + 450
C f(x) = 50x + 400
D f(x) = 50x + 450