Final answer:
Cameras and media card, DVDs and VHS are complements.
Step-by-step explanation:
Complements are goods that are often used together, where consumption of one good tends to enhance consumption of the other. Considering the options given:
- Cameras and media card: Cameras require media cards to store photos and videos, so they are complements.
- 7up and coke: 7up and coke are both soft drinks but they are not typically used together, so they are not complements.
- DVDs and VHS: DVDs and VHS are both used for home video entertainment, so they are complements.
- Video games and gasoline: Video games and gasoline are not related, so they are not complements.