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a. To estimate, we can round 2 and three-fourths to 3. Then, we can multiply 3 by 80 to get an estimate of the total amount of ribbon needed:
3 ft of ribbon per box x 80 boxes = 240 feet of ribbon
b. To find the exact number of feet, we can multiply 2 and three-fourths by 80:
2.75 ft of ribbon per box x 80 boxes = 220 feet of ribbon
c. To find the number of rolls needed, we can divide the total amount of ribbon needed by the amount of ribbon per roll:
220 feet of ribbon รท 50 feet per roll = 4.4 rolls of ribbon
Since we cannot buy a fraction of a roll, we will need to purchase 5 rolls of ribbon to have enough for all 80 boxes.