No, yes, no, yes
What part of comparing number values do you not understand? Most folks figure out enough about place value to be able to answer this by 3rd grade. If there's something about this question that really stumps you, please advise in the comments.
Its 2,9 because thats the highest it gets which is the maximum
X = 3
5(3) - 2 = 13
3(3) + 4 = 13
