exam Maths Puzzle Numerical Ability

What is the official name of a polygon with 9,999 sides?

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exam Other Question

Determine which two equations represent parallel lines.
(a) y = 9x – 7 (b) y = –9x + 7 (c) y = 9x + 3 (d) y = -1/9x – 7

I have no idea even how to begin to figure this out.
Devin has pennies, dimes and quarters. There are two times as many pennies as quarters. There are six times as many dimes as quarters. How many of each coin does he have?