exam Maths Puzzle Numerical Ability

state the doamin of the following?

a) l(x)=2x+3

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exam Other Question

State the domain of m(x)= 5/x^2-9

Help??? Could you help with this problem?
I have to use numbers 1 through 9 to equal 100 using order of operations.
_ divide _ X _ + _ X _ X _ divide _ + _ X _ = 100.
I don't have a ISB