Find, if possible, \( A B \) and \( B A \). If it is not possible, explain why. \[ A=\left[\begin{array}{rr}-4 & 4 \\ 0 & 1\end{array}\right] \quad B=\left[\begin{array}{rrrr}-5 & 0 & 4 & 1 \\ 3 & 0 & 1 & 9\end{array}\right] \]

Sav \( \begin{array}{l}\frac{9 \sqrt{2}}{\sqrt{3}}\end{array} \) \( \begin{array}{l}\text { The answer is } \square . \\ \text { (Simplify your answer. Type an exact answer, } 0 \text { of } 1 \\ \text { using radicals as needed. Use integers or } \\ \text { fractions for any numbers in the expression.) }\end{array} \)

3) Un taller recreativo se realiza solo una vez a la semana, Durante la primera semana asisten 5 personas, y se sabe que aumentan en un \( 100 \% \) cada semana, cen qué semana los asistentes superan por primera vez las 300 personas A) En la 5 B) En la 6 e) En la 7 D) En la 8

Simplify the expression. \( \frac{2(5-4)^{3}-5 \cdot 9+7 \cdot 8}{9^{2}+8^{3}} \) \( \frac{2(5-4)^{3}-5 \cdot 9+7 \cdot 8}{9^{2}+8^{3}}=0.021922 \) (Round to the nearest thousandth.)

3). \( 9 \sqrt{12}+5 \sqrt{32}-\sqrt{72} \)

Simplify and add or subtract wherever possible. \( 2 \sqrt{32}-5 \sqrt{18}-2 \sqrt{27} \) The simplified form is (Type an exact answer, using radicals as needed.)