## Elementary Algebra

$\frac{13}{9}$
Any whole number raised to the power of zero is 1 while any number raised to a negative power is turned into that number's reciprocal with a positive exponent of the same value. Using these same rules, we obtain: $3^{0}+3^{-1}+3^{-2}$ =$1+\frac{1}{3}+\frac{1}{3^{2}}$ =$1+\frac{1}{3}+\frac{1}{9}$ =$\frac{1(9)+1(3)+1}{9}$ =$\frac{9+3+1}{9}$ =$\frac{13}{9}$