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OpenStudy (anonymous):
Two numbers, 3 and a, have a geometric mean of 9. Find the value of a.
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OpenStudy (anonymous):
@sangya21
OpenStudy (anonymous):
Geometric mean of two positive real numbers a and b is defined by square root of (a*b) Hence we have square root(3*a)=9 this implies 3a=9^2=81 Hence a=81/3=27
OpenStudy (anonymous):
@omg1help
OpenStudy (anonymous):
ok so a=27
OpenStudy (anonymous):
yeah
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