Please help with all of these


[tex]\\ \ast\sf\longmapsto 3x^23x^4=3x^{2+4}=3x^6[/tex]
[tex]\\ \ast\sf\longmapsto m^5m^{-3}=m^{5-3}=m^2[/tex]
[tex]\\ \ast\sf\longmapsto 2x^4-6y=x^4-3y[/tex]
[tex]\\ \ast\sf\longmapsto 4a^3c^{-4}4a^{-1}c^4=4a^2c^0=4a^2[/tex]
[tex]\\ \ast\sf\longmapsto 5x^2xy^3=5x^3y^3[/tex]
[tex]\\ \ast\sf\longmapsto (y^6)^0=y^0=1[/tex]
[tex]\\ \ast\sf\longmapsto (3m^3)^3=3m^9[/tex]
[tex]\\ \ast\sf\longmapsto 2x^5)^{-1}=\dfrac{1}{2x^5}[/tex]
[tex]\\ \ast\sf\longmapsto (a^4c^{-1})^2=a^8c^{-2}=\dfrac{a^8}{c^2}[/tex]
[tex]\\ \ast\sf\longmapsto (4x^2y^{-1})^{-1}=4x^{-2}y[/tex]
[tex]\\ \ast\sf\longmapsto \dfrac{y^3}{5y^4}=\dfrac{1}{5y}[/tex]
[tex]\\ \ast\sf\longmapsto \dfrac{8m^6}{8m^5}=8m[/tex]