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OpenStudy (anonymous):
Twelve is the geometric mean of 9 and what number?
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OpenStudy (amistre64):
12 = sqrt(9n)
Directrix (directrix):
If 12 is the geometric mean between 9 and a mystery number x, then the following is true: 9 is to 12 as 12 is to x 9/12 = 12/x Cross Multiply and solve for x. @mathloser101
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