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HELP HELPP PLEASEEEE!

HELP HELPP PLEASEEEE class=

Sagot :

the length is b 12 !

Answer:

Step-by-step explanation:

volume of pyramid with square base=a^2(h/3)

84=a^2*7/3

84*3/7=a^2

252/7=a^2

36=a^2

[tex]\sqrt{36[/tex]=a

6=a

therefore length=6