exam Maths Puzzle Numerical Ability

simplify:

(3x^3 - 1 + 9x) + (3 + 3x)

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exam Other Question

Determine whether it is rational or irrational:

3 sqrt 121

I believe this is rational, is this correct? Thank you
Solve the system using substitution or elimination:
2x-4=-2
4x+8y=0