The options are: x great or equal to 0
integers
all real numbers
x less than or equal to 0
f(x) less than or equal to 0
f(x) greater or equal to 0

Domain for the first graph: all real numbers because the graph is linear and its x values are extended infinitely.
Domain for the second one: x is greater than or equal to 0 because it is a 2nd degree polynomial and it is pointed upward and its x values extend upwards infinitely from the origin.

Domain deals with x values while range deals with y values

X= 2 he can buy 2 packs of cards for $12 and an action figure for $3 so he would spend $15 in total plus the free poster