find the formula for an for the arithmetic sequence.
ok i know how to solve a similar problem when i am given a1 and d. but i dont have either A1 or d so how can i find them? to plug into an=dn+c and c= a1-d?? please help me understand this thank you.
i don't know what you did but it made no sense to me. i actually figured it out. what i did was
a6-a3= 3 terms apart
a6=a3+3d--> 85=94+3d--> d=-3
thank you very much for your time and help mathaddict! it was greatly Appreciated.