need na po ngayon please pa help po

Answer:
1. 5x^2 x 3x^5
=15x^7
2. (-y^3z^2) x (yz^4)
= -y^3z^6
3. (9ab) x (1/3ab^3)
= 3a^2b^4
4. (4x^3y^2) x (3xy)
= 12x^43y^3
5. (-xy)^4 (-3)^3 ( 5x)
(xy) x (-27) x 5x
=5x^2y - 27