13. Para qué valor de " \( x \) " se cumple la siguiente igualdad: \( \frac{\sqrt{(a b)^{2} \cdot \sqrt[3]{c^{x}}}}{\sqrt[3]{a^{x} \sqrt[4]{\left(\frac{c}{b}\right)^{2}}}}=(a b)^{\frac{10}{9} ; a \neq b} \)

b) \( -x^{2}+x+72=0 \)

Type the correct answer in the box. Use numerals instead of words. If necessary, use/ for the fraction bar What value of \( x \) satisfies this equation? \( 1.5(4)^{2 x}=12 \) Round your answer to the nearest hundredth. The value of \( x \) is

Enter the correct answer in the box. Rewrite the expression \( 2 \sqrt[4]{x^{7}} \) using rational exponents. \( \begin{array}{lll}\frac{\square}{\square} & \text { (ㅁ) } \mid \text { 미 } \square^{\square} \mid+--\end{array} \)

It would take Charlene and Gina 18 minutes to organize Charlene's comic book collection if they work together. If Gina works alone, it would take her 15 minutes longer than it would take Charlene working alone. When \( x \) represents the number of minutes it takes Charlene to organize the comic book collection working alone, the situation is represented by this equation: \( \frac{1}{x}+\frac{1}{x+15}=\frac{1}{18} \), Which value is a solution of the rational equation that must be discarded because of the context? A. \( x=0 \) B. \( x=-9 \) C. \( x=-15 \) D. \( x=-30 \)

If no denominator equals zero, which expression is equivalent to \( \frac{x+2}{x^{2}-16} \div \frac{2 x+4}{x^{2}+3 x-4} \) ? A. \( \frac{x-1}{3 / x-1)} \)