Why is the additive inverse of a positive number negative?
a) you need to cancel out the addition in order to get 0, therefore you must add a negative number.
b) the additive inverse of a positive number is not a negative number.
c) you need to cancel out the addition in order to get -1, therefore you must add a negative number.
d) you need to cancel out the addition in order to get 1, therefore you must add a negative number.