Grant is a member of a book club. he pays a $10 yearly membership fee and can purchase books through the club for $2.75 each. his total annual cost is a function of the number of books that he purchases in a year. let b represent the number of books he purchases in a year. which function, c(b), represents his yearly cost? c(b) = 10b + 2.75 c(b)= 2.75b + 10 c(b) = 12.75b c(b) = 2.75b + 20