exam Maths Puzzle Numerical Ability

Please help with (9a/4b)^0. Is it 9a/4b or 1?

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exam Other Question

A ladder 25 ft. long (AD) is leaning against a wall, reaching a point 20 ft. above the ground (CD). The ladder is then moved so that AB= 2(DE). Find BC. Find the sum of the measures of the interior angles of a convex polygon with the given number of sides.

Number of sides-->6

Correct answer would really be appreciated:)