Question

(20 points) Please answer and explain!

Answer 1

Answer:

$\large\boxed{a.\ -3x^5y^6}$

Step-by-step explanation:

$-3x^2y^2\cdot y^4x^3=(-3)(x^2x^3)(y^2y^4)\\\\\text{use}\ a^na^m=a^{n+m}\\\\=-3x^{2+3}y^{2+4}=-3x^5y^6$