SOLUTION: which term of the sequence 39,35,31............... is negative 33?

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Question 725078: which term of the sequence 39,35,31............... is negative 33?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
a=39
d=-4
tn=a+(n-1)d
-33=39+(n-1)-4
-33=39-4n+4
-76=-4n
n=19