Which situation is best represented by the
function f(x), where f(x) = 12x + 5?
A An office-supply store selle x boxes
ballpoint pens that contain a dozen pons
per box for $5 each.
B An Olympic swimmer trains by swimming
12 kilometers on each of x weekdays and
6 kilometers on each day of the weekend.
C An algebra quiz has x problems worth 12
points each plus 5 extra-credit problems
worth 5 points each.
D A company sells x baseball caps for $12
each and charges a $5 shipping fee.