Diep buys a loaf of bread 65 centimeters long. For lunch every afternoon, he cuts 15 centimeters of bread for his sandwich. Diep wants to determine the length of the loaf of bread, l, after d days. What is the equation of the scenario? Is the graph of the equation continuous or discrete?

The loaf starts at 65 centimeters, and Diep uses 15 centimeters each day, so after d days its length is l = 65 − 15d. The graph is discrete because d counts whole days; the loaf’s length is measured only after 0, 1, 2, and so on days, not after fractional days in this scenario. Choice A gives both the equation and the correct graph type.

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