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joja [24]
2 years ago
8

Help plsss 20+ pointsss

Mathematics
1 answer:
Lena [83]2 years ago
4 0

Answer:

3

Step-by-step explanation:

area of square=l*b so

81=3x multiply 3x

81=9x^2

81/9=x^2

9=x^2

\sqrt9=x

3=x

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