exam Maths Puzzle Numerical Ability

I am needing help one last time.

Identify the vertices and foci of the graph of the hyperbola

x^2/16 - y^2/16 = 1

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exam Other Question

Find the sum of the measures of the interior angles of a convex polygon with the given number of sides.

Number of sides-->4

Correct answer would really be appreciated:)
Tutor could you help me check the answer to this problem. (2xy^3)^3=

The answer that I came up with is 2x^3y^9 am I correct?

thank you very much for your time and tutoring!