exam Maths Puzzle Numerical Ability

State the domain of the following

m(x)= 5/x^2+9

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exam Other Question

im stuck on these 2 problems. thanks for your help.

divide and if possible simplify.

problem 1 3y+15/y^7 / y+5/y^2

problem 2 x^2-y^2/4x+4y / 3y-3x/12x^2 6x+2x=7x+1