Respuesta :

Answer:

0.81

Explanation:

0.9 squared can be expressed as;

[tex]0.9^2=(\frac{9}{10})^2=\frac{9^2}{10^2}[/tex]

Let's go ahead and evaluate;

[tex]\frac{9^2}{10^2}=\frac{81}{100}=0.81[/tex]