Final answer:
Joanne used 3 1/2 rolls of 20-yard ribbon for 15 bows, totaling 70 yards or 210 feet. By dividing the total feet of ribbon by the number of bows, we determine she used 14 feet per bow, making C) 14 feet the correct answer.
Step-by-step explanation:
The question requires us to calculate the number of feet of ribbon used per bow by Joanne. First, we'll convert the total number of yards used to feet, and then divide by the number of bows made to find the amount of ribbon per bow.
Joanne used 3 1/2 rolls of ribbon, with each roll being 20 yards. To find the total yards used, we multiply 3.5 (3 1/2 as a decimal) by 20, yielding 70 yards.
Since there are 3 feet in 1 yard, we need to convert yards to feet. 70 yards equals 70 × 3 feet, which is 210 feet.
Joanne made 15 bows in total. Therefore, to find the length of ribbon used for each bow, we divide the total number of feet by the number of bows. Thus, 210 feet / 15 bows equals 14 feet of ribbon per bow.
The correct answer to the question is C) 14 feet.