Question: I need help simplifying these problems.... also how do i have them contain only positive exponents.. 4x^2y^5*2y^3 2x/2x^3y^-4*-4y^-4 (-4m^-2n^4)^-4 -yx^2*(2xy)^5

I need help simplifying these problems.... also how do i have them contain only positive exponents..

4x^2y^5*2y^3

2x/2x^3y^-4*-4y^-4

(-4m^-2n^4)^-4

-yx^2*(2xy)^5

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