0.9 will equal to [tex] \frac{9}{10} [/tex]
Anyhow ! Lets get to the steps!
[tex] \frac{9}{10} - r \leq ?[/tex]
[tex] \frac{9}{10} [/tex]
Now "r" will become a negative
[tex] \frac{9}{10} - - r \leq ?[/tex]
[tex] \frac{-r(10)}{10} [/tex]
[tex] \frac{10(r)+9}{10} \leq 0[/tex]
We have to multiply from each of your sides by the number 10
You can even divide by the number 10 aswell
Back to the steps
[tex]r+ \frac{9}{10} \leq ?[/tex]
Subtract from this fraction [tex] \frac{9}{10} [/tex] to your sides
This would be inequality [tex]r + .900 \leq ? [/tex]
[tex]r \ \textless \ -\frac{9}{10} [/tex] ← this should most likely be your answer
[tex]Now, Good Luck[/tex]