Hi, to whoever sees this question please answer it with a real answer. Loads of people just answer questions with a question or useless info just to get the points. I will be offering 50 points for this question, please help! (Also for those who go to RSM you might recognize these problems or know how to solve them, for those of you who don’t go there, please still try and help)

Express these as a sum
a) a-5
b)4.5-8.3-2
c)1-a-b-c
And please express these as a difference
a)a+5
b)m+n