book Maths Puzzle Numerical Ability

Question:
write each radical expression in simplified radical form.
Square root of 7/square root of 18. this is written as a fraction.
Thank you

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book Other Question

- 3x - 5y + z = 2; 2x - z = 3; x + 2y + z = 8. ok I need to graph and get the intercepts for the problem y = -4x^2 +16x - 12 I know its a downward cone shape but I cannot get the vertex or the intercepts right.