Mathematics

Giovanny Vincent

5 June, 12:38

The elevator in an office building is controlled by a program that uses negative numbers to

indicate moving down and positive numbers to indicate moving up, so the command

+7 causes the elevator to travel 7 floors up.

The elevator is at the 12th floor now. Which series of commands will bring the elevator back

to the 12th floor?

-6, - 6

+3, + 3

-5, - 5, + 5, + 5

+4, + 4,-4.