Answer:
B. The cost, in dollars, for each additional gigabyte used.
Step-by-step explanation:
We are given that,
The equation modeled for the plan is, .
Since, we have that,
<em>The plan has a monthly charge that includes 5 gigabytes of data and over-charge fee for gigabytes exceeding 5 gigabytes.</em>
Thus, when g= 5, C= 59, in dollars.
Also, when g> 5, .
So, we get that,
The expression represents the cost for the additional gigabytes used.
Thus, 15 represents the cost, in dollars, for the additional gigabytes used.
Thus, option B is correct.