exam Maths Puzzle Numerical Ability

Find the reference angle R θ if θ = 210°

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8.3 #16
Solve by substitution
Mcgraw Hill 6th editon,
Thank you for your time!!

5x-2y= -5
y-5x=3
can some one check this before i turn it in please?

(2r-3s)(4r^2+6rs+9s^2)

8r^3+27s^3
48r^4-162s^4