Question 100630
What is the rule for the nth term : 
d = -12 and a(subscript 1) = 80 
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General Rule: a(n)= a(1)+(n-1)d
Your Problem:
a(n)=80+(n-1)*(-12)
a(n)=80-12n+12
a(n)=-12n+92
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Cheers,
Stan H.