exam Maths Puzzle Numerical Ability

I have been struggling on this problem for awhile now and I was wondering if anyone could help me? I would deeply appreciate it!! Please and Thank You!!

Transforming Formulas

a=180(n-2) over n;n

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exam Other Question

How many solutions exist for a quadratic equation? How do we determine whether the solutions are real or complex? How do I graph y=-x if my paper tell me to make a table with any five number that i chose should all my x-values on my table be negative like in the equation?