To determine if each expression is decreased or increased by 8% you can substitute the n in the expressions by 100 and then evaluate the expression, if the result is 92 it decrease, if it is 108 it increase:
First expression: decrease n by 8%
[tex]\begin{gathered} 0.92n \\ 0.92(100)=92 \end{gathered}[/tex]
Second expression: increase n by 8%
[tex]\begin{gathered} 1.08n \\ 1.08(100)=108 \end{gathered}[/tex]
Third expression: increase n by 8%
[tex]\begin{gathered} n+0.08n \\ 100+0.08n=108 \end{gathered}[/tex]
Fourth expression: decreased n by 8%
[tex]\begin{gathered} n-0.08n \\ 100-0.08(100)=92 \end{gathered}[/tex]
