exam Maths Puzzle Numerical Ability

I need help simplifying
the squae root of 28x^2y + the square root of 63x^2y^3. Thank you very much.

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exam Other Question

With a given tail wind, an airplane can travel 1080 mph in six hours. But flying in the opposite direction with the same wind blowing, the plane can fly only one-third of that dist Solve each system by substitution. Determine whether each system is independent, inconsistent, or dependent

3x - 2y = 7
-3x + y = 5