The expression that'll be used in calculating the total cost will be 2.5x + 2y.
Since Gabriel bought 2.5 pounds of apples that are x dollars a pound and 2 bags of lettuce for y dollars each, then the total cost will be:
= (2.5 × x) + (2 × y)
= 2.5x + 2y
Based on the calculation above, the expression that'll be used in calculating the total cost will be 2.5x + 2y.
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