A: [tex]3x^2y^4\cdot2x^6y=6x^8y^5[/tex]
B: [tex]xz^3\cdot4x^4z^5=4x^5z^8[/tex]
C: [tex]4a^3^2\cdot 3a^6b^5=12a^{15}b^5[/tex]
D: [tex]6s^{5t}\cdot s^{4t}^2=6s^{16t^2+5t}[/tex]
There was some ambiguity you posed with such exponents but I assumed strictly.
Hope this helps.
