Think of it like this
-3 means move 3 spaces back (or left)
+4 means move 4 spaces forward (or right)
so, from 0, move 3 spaces left
then move 4 spaces right
end up with 1 space right or +1
First turn 28 kilograms into pounds by multiplying 2.2 by 28. You end up with 61.6 pounds lost in one week. Next you take 61.6 divided by 7 to know how many pounds were lost in each day. You should end up with about 8.8 pounds.