Final answer:
The correct two-variable equation to represent the total of five activities chosen each day at summer camp, split into indoor (I) and outdoor (O) activities, is I + O = 5.
Step-by-step explanation:
When selecting activities at summer camp, you can represent your choices with a two-variable equation. Since you need to choose a total of five activities each day, and these can be either indoor activities (I) or outdoor activities (O), the equation would be I + O = 5. This equation shows that the sum of indoor and outdoor activities must equal five, capturing your daily activity choices at camp.