Answer: 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.
Answer: A: Sebastian should have used –9 and 7. I have proof and evidence. plz mark me brainliest.
Step-by-step explanation: Ok so the question is 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. And the expression was 9+(-7) so this expression is wrong because if he goes from the main floor to the 7th floor it has to be +7 instead of +9 so then he goes DOWN 9 floors so it should be (-9) so Sebastian should have used -9 and 7 (7+(-9))
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Proof/Evidence:
