Answer:
[tex]\large\boxed{9.\ 3y^2}\\\boxed{10.\ 7y^2}[/tex]
Step-by-step explanation:
[tex]9.\\36y^2=2\cdot2\cdot3\cdot\boxed3\cdot\boxed{y^2}\\\\21y^3=\boxed3\cdot7\cdot\boxed{y^2}\cdoty\\\\GCF(36y^2;\ 21y^3)=\boxed3\cdot\boxed{y^2}=3y^2\\\\10.\\49x^2y^2=\boxed7\cdot7\cdot x^2\cdot \boxed{y^2}\\\\21y^3=3\cdot\boxed7\cdot\boxed{y^2}\cdot y\\\\GDF(49x^2y^2;\ 21y^3)=\boxed7\cdot\boxed{y^2}=7y^2[/tex]
