Jovante decides to start a business by making buttons and selling them for 25 cents each. the button machine costs $125 and the materials for each button cost 10 cents. write a cost function, c, that represents the cost in dollars of making n buttons. a. c(n) = .10n + 125 c. c(n) = 125.10n b. c(n) = 125n + .10 d. c(n) = n + 125.10