answer
the formula is a+(n-1)d
a: the first term
d:the 2nd term -the first term
Answer:
-679
Explanation:
14, 5, -4, ...
a = 14
d = 5 - 14 = -9
nth term = a + (n - 1) d
n(78) = 14 + (78 - 1) * -9
= 14 + 77(-9)
= 14 -693
= -679
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