Answer:
9 yd
Step-by-step explanation:
15 yd - 6 yd = 9 yd
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The top has a length of 15 yd
The bottom has a length of 6 +x
15 = 6+x
Subtract 6 from each side
15-6 = 6-6+x
9 = x
9 yds in the missing length
