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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