exam Maths Puzzle Numerical Ability

State the domain and range of the top half of the circle x2 + y2 = 16

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exam Other Question

I am suppose to add and express in the simplest form.

x-13/x^2-x-12 + 3x-3/x^2-x-12

Could you tell me if I have this correct I got: 4 / x - 4

Is this correct? Thank you for your help.
Solve.

4(7x+10)=3(9x-5)+20