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3^{1}\times 9^{-\frac{1}{2}}
To raise a power to another power, multiply the exponents. Multiply -\frac{1}{2} and -2 to get 1.
3\times 9^{-\frac{1}{2}}
Calculate 3 to the power of 1 and get 3.
3\times \frac{1}{3}
Calculate 9 to the power of -\frac{1}{2} and get \frac{1}{3}.
1
Multiply 3 and \frac{1}{3} to get 1.