Algebra 1: Rate of Change

Question

A telephone company offers a monthly airtime fee, a, and 0.45 per text message sent. Write an equation that best describes the total monthly charge, c, for n text messages.

Answer Choices:

A. c - n + 0.45a

B. c = a + 0.45n

C. c = 0.45a + 0.45n

D. c = a + n

Answer 1

B is the answer

It means that total charge is equal to airtime plus 0.45 for every sent message