Arithmetic Sequence

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.

asked by Nina
  1. 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

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

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

    posted by UNKNOWN

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