this is on my home work 3y + 2y + y2 +5 +y and I'm confused of what i have to do and the question says simplify each algebraic expression below, if possible , if not possible to simplify the expression , explain why not.

3y + 2y + y2 +5 +y

I suspect you mean
3y + 2y + y^2 +5 +y
collect like terms
which is
y^2 + 6 y + 5