Book Maths Puzzle Algebra

A boxing ring in the shape of a square, 20 ft on each side. How far apart would the boxers be when they are in opposite corners of the ring?

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Book Other Question

A roofer tosses a piece of roofing tile from a roof onto the ground 30 feet below. He tosses the tile with an initial downward velocity of 10 feet per second. The unit cost in dollars for manufacturing n starters is given by C = 0.004n^2 - 3.2n + 660. What is the unit cost when 390 starters are manufactured? For what number