Asked by student

if {an} is an arithmetic where a1=-23 and the common difference is 6, find a79.

A. 445
B. 491
C. 439
D. 451

please help
Answered by oobleck
per the usual definition,
a79 = a1 + 78d
so now just plug in your numbers
Answered by just walk da walk 2nite
answer is 445. a1+78(6)=445. :)
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