Mathematics, 23.10.2021 07:30, 23espinosajose
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 + (negative 7) What is Sebastianβs error? Sebastian should have used β9 and 7. Sebastian should have started at zero before adding β7. Sebastian should have switched the two addends and written Negative 7 + 9. Sebastian should have used 0 and β9.
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