Final answer:
The fabric costs $0.35 per inch. This was calculated by first converting feet to inches (3 feet is equal to 36 inches) and then dividing the total cost by the total number of inches.
Step-by-step explanation:
Janelle spent $12.60 for 3 feet of fabric, and the student is asking to calculate the cost per inch. To find this, first convert the total feet to inches, since there are 12 inches in one foot. Thus, 3 feet is equal to 3 times 12 inches, which is 36 inches.
Now, we divide the total cost by the total number of inches to get the cost per inch:
$12.60 / 36 inches = $0.35 per inch.
So, the fabric costs $0.35 per inch.