Total number of rows does Brenda's vegetable garden has [tex]=13[/tex]
Total number of plants in each row [tex]=8[/tex]
Total number of rows Brenda wants to plant peppers [tex]=4[/tex]
Total number of rows left to plant tomatoes [tex]=13-4=9[/tex]
Since, total number of plants that can be planted in each row [tex]=8[/tex]
Therefore, number of tomato plants that Brenda will plant are [tex]=9 \times 8 = 72 \ plants[/tex]