Final answer:
Tamir's total cost for 2.5 pounds of fish and two bananas is $14.65. Subtracting this from a $20 bill, he received $5.35 in change.
Step-by-step explanation:
To calculate the change Tamir received from a $20 bill after his purchases, we create an expression that subtracts the total cost of the items he bought from $20.00.
First, we find the total cost of the fish: 2.5 pounds of fish at $5.50 per pound equals $13.75.
Next, we calculate the cost of the bananas: 2 bananas at $0.45 each equals $0.90.
Now, we add the cost of the fish and bananas together to find the total amount spent, which is $13.75 + $0.90 = $14.65.
The expression to find the change Tamir received is $20.00 - $14.65 = $5.35.
Therefore, Tamir received $5.35 in change from a $20 bill after his purchase.