Welcome to the CH forums.
This sounds very much like homework, if you don't understand the question you should ask your tutor for advice.
Here is a definition of an asignment statement:
An executable statement that defines or redefines a variable based on the result of expression evaluation.
As a general rule we don't do homework but ...
A=A + 2
redefines the variable A to the result of expression evaluation A + 2
Good luck with your studies.