Posted by Nina on Sunday, September 30, 2012 at 5:31am.
Given the third term of an arithmetic sequence less than the fourth term by three. The seventh term is two times the fifth term. Find the common difference and the first term.

Arithmetic Sequence  Steve, Sunday, September 30, 2012 at 7:47am
since the terms have a constant difference, the difference is 3.
a+6*3 = 2(a+4*3)
a+18 = 2a+24
a = 6
sequence is 6,3,0,3,6,9,12,15,18,21,24
T7 = 12 = 2*6 = 2T5

Arithmetic Sequence  UNKNOWN, Wednesday, December 17, 2014 at 9:36pm
I CANT GET IT. PLS LIST DOWN ALL THE SOLUTIONS ONE BY ONE. SO THAT I CAN UNDERSTAND. THANK YOU SO MUCH!!!

Arithmetic Sequence  UNKNOWN, Wednesday, December 17, 2014 at 9:38pm
ANYONE? PLS HELP ME! MY FRIEND A.K.A MY ROOMATE NEED TO SOLVE THIS QUEST ASAP. THANKYOUUUUUU 😘
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