Question

1. a cell phone company charges $60.00 a month for up to 1 gigabyte of data. the cost of additional data is $0.05 per megabyte. if d represents the number of additional megabytes used and c represents the total charges at the end of the month, what linear equation can be used to determine a users monthly bill?

Explanation:

Step1: Identify fixed - cost

The fixed cost for up to 1 gigabyte of data is $60.

Step2: Identify variable - cost

The cost per additional megabyte is $0.05 and the number of additional megabytes is $d$, so the variable cost is $0.05d$.

Step3: Form the linear equation

The total cost $c$ is the sum of the fixed cost and the variable cost. So, $c = 60+0.05d$.

Answer:

$c = 60 + 0.05d$