book Maths Puzzle Numerical Ability

A Regualr polygon of n sides inscribed in a circle of radius r has 3r squared. What is the value of n?

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book Other Question

Here is the question:
2v(3v2-1) - (6-8v3+14v)+3

here is my attempt:
6v3-2v - 6+6v2+3
4v2-3=6v2

What is the rule with exponents ?

~Tabitha What is 12-7/6*15-8? Please help me solve this.