Final answer:
In the expression 6.70 + 0.50x used by a company for shipping, the 0.50 stands for the cost of one stamp.
Step-by-step explanation:
In the expression 6.70 + 0.50x, which models the cost for a company to ship packages and purchase stamps, the 0.50 represents the cost of one stamp. The fixed cost of $6.70 accounts for the cost of shipping one package, similar to an initial fee. Therefore, for every stamp the company purchases, an additional $0.50 is added to the total cost. The variable x stands for the number of stamps purchased, making the total cost a combination of the fixed shipping cost and the variable cost of the stamps.