Length = 20 ft
If he uses 60 ft of fencing to line his rectangular backyard, then the perimeter is 60 ft.
Perimeter formula is ((Width × 2) + (Length × 2))
10 × 2 = 20
20 × 2 = 40
40 + 20 = 60
david is ordering a photo book for his mom. The cost for a 7" x 9" book with 10 pages is 20$. Each additional page costs $1.50
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