exam Maths Puzzle Numerical Ability

x + y = 5
2x + 2y = 10

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exam Other Question

Determine if the functions are even, odd, or neither
f(x)= -x+2/x and g(x)+x^3-3x^2+1 Please help me with this problem I am about to pull my hair out.

Suppose that a polynomial function of degree 4 with rational coefficients has -1,0, and 2-3i as zeros. What is the remaining zero?