The equation which may be used to find the cost of 3.5 pounds of grapes according to the price per pound of grape given in the task content is; Cost = 3.5 × $1.55.
It follows from the task content that the given relationship is that; 1 pound of grapes cause $1.55.
Hence, it follows from the concept of ratios and proportions that the cost of 3.5 pounds of grapes can be evaluated as follows;
Cost = 3.5 × $1.55
Ultimately, the equation which describes the cost is; Cost = 3.5 × $1.55.
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