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9 is the geometric mean between 4 and which other number?

A. 20.25

B. 81

C. 9

D. None of the choices are correct.

Respuesta :

choixongdong
answer is A. 20.25

cause 20.25 x 9 = 81
√81 = 9
so 9 is the geometric mean between 4 and 20.25

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