I.)Determine the excluded value/s

1.)6x
_____
2x3⁴

2.)x³-4y+1
_________
x²-5x+6


II.) Evaluate the rational algebraic expression.

1.) 5x
______ X=4
3x-9

2.) y²+4y+1
__________ y=-2
y²-2

III.) Simplify

1.) 45a²b
________
30ab.

give me the correct answer
​