The cost to produce a custom designed t shirt is five dollars per shirt plus a 40 dollar design fee. which of th following could be data points that would fit this situation

Ok so if we have five dollars per shirt, and if the number of shirts we buy is x, we have 5x dollars for the price. there is also a $40 design fee, so that adds 40. we do not need to pay 40 for every shirt, just once for the whole group, so we have 5x+40 as our answer

What the heck don’t understand