Final answer:
The expression for the amount of change Abigail receives after her groceries purchases is $30.00 - (1.79A + 0.36B + 2.99), where 'A' is the pounds of apples and 'B' is the number of bananas.
Step-by-step explanation:
To determine the expression that represents the amount of change Abigail receives after purchasing her groceries, we must first calculate the total cost of her purchases and then subtract this from the amount of money she has. The apples cost $1.79 per pound, the bananas cost $0.36 each, and the potatoes cost $2.99 for a 3 lb bag. We represent the number of pounds of apples as variable 'A' and the number of bananas as variable 'B', thus the total cost of the apples is 1.79A and the cost of the bananas is 0.36B. The potatoes have a fixed cost of $2.99. With $30.00 to spend, the expression for the change received would be the initial amount ($30.00) minus the total cost of items (1.79A + 0.36B + 2.99).
The expression for the amount of change Abigail receives after her purchases is $30.00 - (1.79A + 0.36B + 2.99).