Please help with all of these

$\\ \ast\sf\longmapsto 3x^23x^4=3x^(2+4)=3x^6$

$\\ \ast\sf\longmapsto m^5m^(-3)=m^(5-3)=m^2$

$\\ \ast\sf\longmapsto 2x^4-6y=x^4-3y$

$\\ \ast\sf\longmapsto 4a^3c^(-4)4a^(-1)c^4=4a^2c^0=4a^2$

$\\ \ast\sf\longmapsto 5x^2xy^3=5x^3y^3$

$\\ \ast\sf\longmapsto (y^6)^0=y^0=1$

$\\ \ast\sf\longmapsto (3m^3)^3=3m^9$

$\\ \ast\sf\longmapsto 2x^5)^(-1)=(1)/(2x^5)$

$\\ \ast\sf\longmapsto (a^4c^(-1))^2=a^8c^(-2)=(a^8)/(c^2)$

$\\ \ast\sf\longmapsto (4x^2y^(-1))^(-1)=4x^(-2)y$

$\\ \ast\sf\longmapsto (y^3)/(5y^4)=(1)/(5y)$

$\\ \ast\sf\longmapsto (8m^6)/(8m^5)=8m$

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