Final answer:
The subject of this question is Mathematics. The total cost of activating Xfinity internet is $125.
Step-by-step explanation:
The subject of this question is Mathematics. The question is asking about the charges associated with Xfinity internet, specifically the activation fee and monthly fee. To answer the question, we need to calculate the total cost of activating Xfinity internet.
The activation fee is $75 and the monthly fee is $50. To calculate the total cost, we add the activation fee and the monthly fee: $75 + $50 = $125. Therefore, the total cost of activating Xfinity internet is $125.