Final answer:
The algebraic expression for the total cost of the fish is (Cost per Balas x b) + (Cost per Catfish x c).
Step-by-step explanation:
An algebraic expression for the total cost of the fish can be written as:
Total Cost = (Cost per Balas x b) + (Cost per Catfish x c)
where Cost per Balas is the cost of one Balas and Cost per Catfish is the cost of one Catfish.
For example, if the cost of one Balas is $5 and the cost of one Catfish is $3, the expression would be:
Total Cost = (5 x b) + (3 x c)