18²

Answer:DStep-by-step explanation:We will use the radical property  [tex]\sqrt{a*b} =\sqrt{a} \sqrt{b}[/tex]  to simplify this.The problem is  [tex]\sqrt{169*x^5}[/tex]We can simplify this as:[tex]\sqrt{169*x^5} \\=\sqrt{169} \sqrt{x^5}[/tex]Now we can use the property of radicals,  [tex]\sqrt[n]{x^a} =x^{\frac{a}{n}}[/tex]  , to write as:[tex]\sqrt{169} \sqrt{x^5} \\13*x^{\frac{5}{2}}[/tex]D is right answer.