exam Maths Puzzle Numerical Ability

please help me factor as completely as possible
5x^3y-15x^4y^2 i know i have to find the gcf first 5*15=75 but i dont know what to do after that.

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exam Other Question
Solve to four decimal places: 3.9^(m-4)=10.21.

Thanks Which value is not in the domain of the function y=3/x
a. -3
b. 0
c. 1
d. 6

Can you teach me how to do it. because i really dont know... and i need help with it...