Arithmetic Sequence

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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 -

    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 -

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

  • Arithmetic Sequence -

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

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