540
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180n - 360 = S
Add 360 to each side:
180n = S + 360
Divide each side by 180:
n = (S + 360)/180 = (S/180) + 2
53
You need to get n alone.9n=45 → Divide by 9n=45/9n=5
4n2-25 = 0 4n2=25 n2=6.25 n=sqrt(6.25) n= +2.5 or -2.5
3n -5 = 19 3n = 19+5 3n = 24 n = 8
169