Arithmetic Sequence
posted by Nina
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.

Steve
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 
UNKNOWN
I CANT GET IT. PLS LIST DOWN ALL THE SOLUTIONS ONE BY ONE. SO THAT I CAN UNDERSTAND. THANK YOU SO MUCH!!!

UNKNOWN
ANYONE? PLS HELP ME! MY FRIEND A.K.A MY ROOMATE NEED TO SOLVE THIS QUEST ASAP. THANKYOUUUUUU 😘
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