I have this homework 4 prealgebra where i have to do subtractions with integers and the letter of the exercise goes in the box that has the number of the answer then when im finish the is gonna come out to da title question What should you do when you cant sleep?my answer doesnt make any sense!hekp me plz!its pqealgebra with pizzazi

Go back and do the problems again. Obviously, you've made some mistakes.