Ineed !
q: in 2013 , the united states postal service charged $0.46 to mail a letter weighing up to 1 oz. and $0.20 per ounce for each additional ounce. which function would determine the cost, in dollars, c(z), of mailing a letter weighing x ounces where z is an integer greater than 1 ?

possible answers: a. c(z) = 0.46 + 0.20, b. c(z) = 0.20z + 0.46, c. c(z) = 0.46( z - 1 ) + 0.20, d. c(z) = 0.20 (z - 1 ) +0.46