1. The problem asks to "open the denominator," which typically means to simplify or rewrite an expression by removing a fraction in the denominator. 2. To clarify, if you have a fraction like $\frac{a}{\frac{b}{c}}$, "opening the denominator" means rewriting it as $\frac{a}{1} \times \frac{c}{b} = \frac{a \times c}{b}$. 3. This uses the rule that dividing by a fraction is the same as multiplying by its reciprocal. 4. For example, if the expression is $\frac{5}{\frac{2}{3}}$, opening the denominator gives $5 \times \frac{3}{2} = \frac{15}{2}$. 5. Without a specific expression, this is the general approach: multiply the numerator by the reciprocal of the denominator fraction. 6. If you provide the exact expression, I can show the detailed steps for that case.