Acell phone company charges $35 a month, plus $0.25 per text messages after the first 450 text messages. let c be the total monthly phone bill and t be the number of text messages sent. if sally texted more than 450 times in the following month of july, which of the following equations could she use to determine the total cost of her july phone bill?

a.) c = 35 + 0.25t
b.) c - 450 = 0.25t + 35
c.) c - 35 = 0.25 (t - 450)
d.) c = 35 + 0.25 (t + 450)