Sebastian was in a hotel lobby and took the elevator up 7 floors to his room. Then he took the elevator down 9 floors to the parking garage. He described his movement with the expression below. 9 + (-7) What is Sebastian's error?
a. Sebastian should have used - 9 and 7.
b. Sebastian should have started at zero before adding - 7.
c. Sebastian should have switched the two addends and written - 7 + 9.
d. Sebastian should have used 0 and - 9.
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