exam Maths Puzzle Numerical Ability

Solve the system by addition. x + y = 9 x – y = 9

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exam Other Question

what values are excluded from the domain of the function
a) f(x)=5x+1
b)g(x)=3x+1/x+3
Dividing Polynomials: synthetic

3x^4 - 8x^2 + 7 divided by x - 2

please help me if you can