Hello there!
[tex]1-f=\frac{9}{10}[/tex]
Explanation:
↓↓↓↓↓↓↓↓↓↓↓↓↓
First you had to subtract by 1 from both sides of the equation.
[tex]1-f-1=\frac{9}{10}-1[/tex]
Simplify
[tex]-f=-\frac{1}{10}[/tex]
Then you divide by -1 from both sides of the equation.
[tex]\frac{-f}{-1}=-\frac{1}{10}/-1[/tex]
Simplify it should the correct answer.
[tex]f=\frac{1}{10}[/tex]
Answer⇒⇒⇒f=1/10
Hope this helps!
Thank you for posting your question at here on Brainly.
Have a great day!
-Charlie
