(n-2) 180=n/2(240 + (n-1)5)
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Step-by-step explanation:
(n-2) 180=n/2(240 + (n-1)5)
180n-360=n/2(240+5n-5)
180n-360=n/2(235+5n)
180n-360=235n/2+5n²/2
(180n-360)2=235n+5n²
360n-720=235n+5n²
5n²+235-360n+720=0
5n²-125n+720=0
5n²-80n-45n+720=0
5n(n-16)-45(n-16)=0
(5n-45)(n-16)=0
n=45/5 or n=16
n=9 or n=16
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