Answer:4/9
Step-by-step explanation:
Because you would do keep change flip flipping the 9/4 to 4/9
[tex]\bf 10\div \stackrel{mixed}{2\frac{1}{4}}\implies 10\div \cfrac{2\cdot 4+1}{4}\implies 10\qquad \div \stackrel{improper}{\cfrac{9}{4}} \\\\\\ \cfrac{10}{1}\div \cfrac{9}{4}\implies \cfrac{10}{1}\cdot \cfrac{4}{9}\implies \cfrac{40}{9}\implies 4\frac{4}{9}[/tex]
