Answer: The length is 15 feet.
Step-by-step explanation:
- L = 3w - 3 (length is 3 feet less than three times the width)
- 21 = w + (3w -3)
- 21 = 4w - 3 (add like terms)
- 24 = 4w (substract 3 from both sides)
- 6 = w <-- width
But, the problem is asking for the length...
- L = 3w - 3
- L = 3(6) - 3
- L = 18 - 3
- L = 15 ft
