The equation shows that the pounds of potato that Sarah must purchase in order to qualify for the stores promotional sale is 3.16 pounds.
Based on the information given, the equation will be:
(4.75 × x) + 85 >= 100
4.75x + 85 >= 100
4.75x >= 100 - 85
4.75x >= 15
x >= 15/4.75
x >= 3.16
Therefore, the equation shows that the pounds of potato that Sarah must purchase in order to qualify for the stores promotional sale is 3.16 pounds.
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