exam Maths Puzzle Numerical Ability

ok the problem i need help on
if

find the exact area of a regular dodecagon inscribed in circle with the radius R

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exam Other Question

Determine if the given numbers are solutions of the inequality.
7, -12, -14, -2

y-8>2y-2

Help me i do not no how to do these correctly Hello. Please help me ASAP- I need to turn this in quick. So I have a worksheet that says that I need to discriminate the solutions of the quadratic equation: x squared + 5x + 3 + a. How do I do it and what does the direction mean?

Thanks.