I need to make sure I got it right, please help. Thank you very much

We were given that:
[tex]\frac{6y^2+3}{y+3}+\frac{4}{y+3}[/tex]The denominator refers to the number below the line in a fraction. It is the divisor
The common denominator would refer to a denominator that is common to both terms of the expression above. We have it thus:
[tex]^{\doubleprime}y+3^{\doubleprime}[/tex]''y + 3'' is a common denominator to both terms