To simplify the expression using the Product Rule of Exponents, we use the rule that states:
\[ a^m \cdot a^n = a^{m+n} \]
In your case, we have:
\[ 3^3 \cdot 3^2 \]
Using the Product Rule, we can add the exponents:
\[ 3^3 \cdot 3^2 = 3^{3+2} = 3^5 \]
Now, we can calculate \(3^5\):
\[ 3^5 = 3 \cdot 3 \cdot 3 \cdot 3 \cdot 3 = 243 \]
So, the equivalent expression is:
\[ 3^5 \quad \text{or} \quad 243 \]