Whats the first ten terms of a sequence whose first term is -10 and whose common difference is -2.

we know the first term is -10, and the common difference is -2

-10

-10 - 2

-10 - 2 - 2

-10 - 2 - 2 - 2

-10 - 2 - 2 - 2 - 2

and so on.

this doesn't make sense lol

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.