Question

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 Sebastian’s error?

Answer 1

that would leave him on floor 2

Explanation:

it should be 7-9 because he went up 7 floors then down 9 floors. Sebastian put in his equation that he went up 9 floors then came down 2

Answer 2

Answer: He accidentally mixed up the numbers, he should've described his movement with 7+(-9)

Explanation: