1) Simplify: 3 p^2 x^4 y p^5 x x y y^2

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My answer: 3 p^7 x^6 y^4 ?

2) Simplify by adding like terms: xyp^2 - 4p^2xy + 5xp^2y - 7yxp^2

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My answer: 1xyp^2 - 7yxp^2

Is this right so far?

3) Factor Greatest common factor: 6 x^2 y^2 m - 14 x y^5 m^2 +24 x^10 y^6 m^4

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My answer: I honestly have no idea how to do GCF this way with exponents!

Any help would be greatly appreciated. Thank you!

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*Thank you Stapel. XD*