Guys, please help me

Hi! I believe I have the answer.
1-
a) the opposite of -5 is 5
b) the opposite of 28 is -28
c) the opposite of -10.4 is 10.4
a) the opposite of 0.875 is -0.875
b) the opposite of 0 is -0
c) the opposite of -8,003 is 8,003
I hope that helps!