Sean collects trading cards. the number of cards that he owns is given by the fiction y=10x+25, where is x is the time of months since he began collecting.
which is the best interpretation of the constant term in this function?

a. the number of cards that he had when he started his collection

b. the number of new cards that he gets each month

c. the number of cards he has currently

d. the cost of a new pack of trading cards