Final answer:
The unit rate for $280 for 15 ft² is $18.67/ft².
Step-by-step explanation:
The unit rate is found by dividing the total cost by the total number of units (in this case, square footage). To find the unit rate of $280 for 15 ft², we divide 280 by 15, which gives us approximately $18.67. Therefore, the unit rate is $18.67 per square foot.
To calculate the unit rate, use the following steps:
- Identify the total cost given, which is $280.
- Identify the total square footage, which is 15 ft².
- Divide the total cost by the total square footage to get the unit rate: $280 ÷ 15 ft² = $18.67 per ft².