Question

HELP 10 POINTS

Kiana is staying on the 5th floor of a hotel. She rode an elevator down 7 floors from her room to the parking garage to get her backpack out of her car. Then she rode the elevator back up 2 floors to the hotel lobby.

Which of the following expressions represent this real-word situation? Check all that apply.
5 + 7 + 2
5 + (–7) + 2
(–5) + 7 + 2
5 + 2 + (–7)

Answer 1

The 2nd and 4th expressions are the appropriate ones.  Both result in '0' which means that Kiana is on the ground floor of the building at the end.

Answer 2

The expressions 5+(-7)+2 and (-5)+7+2 give the same meaning as both implies to zero mathematically. So, she is in the hotel lobby.

Expression of the statement:

The exact expression of the statement representing the real-world situation  is given by

• Kiara is on the 5th floor ⇒ 5
• She rode an elevator down 7 floors from her room ⇒ 5+(-7)
• then she rode the elevator back up 2 floors to

         the hotel lobby ⇒ 5+ (-7) +2

If we follow the order then the expression 5+ (-7) +2 is correct.

If we don't follow the order and consider it mathematically then both the expressions 5+(-7)+2 and (-5)+7+2 are correct.

Know more about the mathematical expression:

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