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?
Answer
A
65 is equal to l minus 15 d ; discrete
B
l is equal to 65 minus 15 d ; discrete
C
65 is equal to l minus 15 d ; continuous
D
l is equal to 65 minus 15 d ; continuous
Explanation
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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