Anumber is decreased by seven. then, the new number is multiplied by 3 to get an answer of -9.

what is the original number?

-30
30
4
-4

4

Step-by-step explanation:

You call the number x. Then you do (x-7) * 3=-9.

3x-21=-9

3x=12

x=4

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

answer: 414,377,008

step-by-step explanation:

just multiply it