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?

Diep starts with 65 centimeters of bread and uses 15 centimeters each day, so after d days the remaining length is l = 65 − 15d. The number of days is counted in whole days, so the possible values of d—and therefore the graph—are discrete. Choice B gives both the equation and the graph type.

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