The expression that can be used to determine the total cost of the grapes is 3.9 x 1.80.
Total cost is the unit cost multiplied by the total quantity of grapes bought. Multiplication is the process of determining the product of a number using a mathematical operation.
Total cost = unit cost x total pounds
3.9 x 1.80.
To learn more about multiplication, please check: https://brainly.com/question/3385014
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