exam Maths Puzzle Numerical Ability

determine if the equation represents ay as a function of x.
x^2+y=4
please help me thanks

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exam Other Question

f(x)=2x^2-x+7 ; g(x)=x-1

find (f-g)(x)

I don't know if I am to just subtract or put in the proper way. I am lost. Two dice are rolled. Find the probability of getting a sum greater than 8

Is it 0, 13/36, 2/9, 5/18.

Can you tell me how to work this out?

Thank you, Ellen