A student is helping decorate a bulletin board that is 5 feet long and 4 feet tall.. He needs to cut a piece of yarn to run along the diagonal from the top left to the bottom right of the board.

answer: the dogs need to shift their focus to human scent.

its because the dogs being trained are for search and rescue thus they need to be able to track humans and their specific scent

-4

step-by-step explanation:

(-4+8)=-(4-8)=-8+4=-4