Final answer:
The correct equation that represents the cost (c) for every 10 photos (p) is option (a), expressed as c = 0.2p, indicating the cost is $0.20 per photo.
Step-by-step explanation:
The question is asking to write an equation representing the cost (c) for every 10 photos (p). We want to determine the correct relationship between the number of photos and their total cost. For every 10 photos, the total cost is $2. Therefore, the cost increases by $2 for every 10 photos. To create an equation, we divide the total cost by the number of photo groups (each group containing 10 photos). Since $2 is the cost of 10 photos, the cost per photo (p) is $2 divided by 10, which equals $0.20 per photo. Thus, the equation representing this relationship is c = 0.2p. Option (a) c = 0.2p is the correct choice because it aligns with the cost structure provided. Additionally, it's worth noting that this problem is similar to computing amounts spent on items in finance, which can be found in examples like computing the expense on apples, bananas, or other items where quantity is multiplied by price