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 sebastains error

He took 9 instead of -9 and -7 instead of only 7.

Step-by-step explanation:

We know that in integers , we use negative(-) sign to represent the "down" or loss and positive(+) sign to represent "up" or "gain" in any amount.

Since , we have given that , Sebastian was in a hotel lobby and took the elevator up 7 floors to his room.

This will represent by 7 not -7 in integers.

Then he took the elevator down 9 floors to the parking garage.

This will represent by -9 not only 9 in integers.

Then , the movement of Sebastian is given by : +7+(-9)

Therefore, the Sebastian's error is : He took 9 instead of -9 and -7 instead of only 7.

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