Answer:
[tex]3.5b - 40[/tex] where [tex]b[/tex] is the amount of banners sold.
Step-by-step explanation:
We know the team has already spent $40, and they earn #3.5 per banner.
Hence, with [tex]b[/tex] representing the amount of banners sold, the equation is [tex]3.5b - 40[/tex]