How can you determine if a linear function or an exponential function is a better model for the data?

  Linear functions are generally beneficial for data that changes at a constant rate. Meanwhile, exponential functions are generally good models for data that increases or decreases at rates that aren't constant.

You can use a calculater and divide the minutes by the $$, hope that you

B. because the 7 represents "seven times", x represents "a number", 12 represents "plus twelve", and -4 represents "minus four"