Question

Each month, the charge for a cell phone plan consists of a flat fee of $42, plus $12 per gigabyte of data.

Which equation represents the total monthly charge for the plan, C(d) dollars, as a function of the number
of gigabytes of data, d ?
A. C(d) = 12(42)d
B. C(d) = 12d +42
C. C(d) = 42d + 12
D. C(d) = (12 + 42)d

Answer 1

B.) C(d)= 12d+42

Explanation:

A flat fee means it is only paid once and doesn't increase or decrease.

The gigabytes of data fluctuate how much you pay the 12 dollar amount.

Meaning 12d represents the price of data and +42 shows the flat rate.

Overall giving us the equation C(d)= 12d+42.