exam Maths Puzzle Numerical Ability

solve the equation x^2=-81

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exam Other Question

Each side of a regular hexagon has length 10. Find the area of the hexagon.
(Hint: Divide the Hexagon into triangles)

The answer in the answer key is 150 square roots of 3.
Can you please help me solve this problem and show me?

Solve for x
15 < 8 - 3x _> 20

Thank You