Step 1
Given;
[tex]\begin{gathered} A\text{ regular price of r for a comic book on sale} \\ A\text{ discount of \$1 before tax} \end{gathered}[/tex]Required; To
1) write an expression to find what was paid by Ron before taxes
2)Find the total cost before taxes of the comic books, if each one costs $2.50
Step 2
Write the expression of what Ron paid before taxes
[tex]\begin{gathered} \text{\$}2(r-1) \\ \text{Note; One book costs \$(r-1)} \\ \text{\$}(2r-2) \end{gathered}[/tex]Step 3
If each book was regularly $2.50, find the total cost before taxes
[tex]\begin{gathered} r=\text{\$}2.50 \\ \text{Total cost=\$(2(2.50)-2)} \\ \text{Total cost=\$(5-2)=\$}3 \end{gathered}[/tex]