Answer:
The expressions that can represent total cost with sales tax are;
[tex]\begin{gathered} 1.08n \\ n+0.08n \end{gathered}[/tex]The expression that does not represent total cost with sales tax are;
[tex]\begin{gathered} n+0.08 \\ 0.08n \\ n+1.08n \end{gathered}[/tex]Explanation:
Given that the cost of a sweatshirt is n dollars.
And sales tax is 8%.
Total cost equals the cost plus sales tax.
[tex]\begin{gathered} n+8\text{\% of n} \\ n+\frac{8}{100}n \\ n+0.08n \\ 1.08n \end{gathered}[/tex]Therefore,
The expressions that can represent total cost with sales tax are;
[tex]\begin{gathered} 1.08n \\ n+0.08n \end{gathered}[/tex]The expression that does not represent total cost with sales tax are;
[tex]\begin{gathered} n+0.08 \\ 0.08n \\ n+1.08n \end{gathered}[/tex]