SOLUTION: if 5x-3, x+2 and 3x-11 form an arithmetic progression, find the first term and the 21st term

Algebra ->  Sequences-and-series -> SOLUTION: if 5x-3, x+2 and 3x-11 form an arithmetic progression, find the first term and the 21st term      Log On

 

Hi,

5x-3, x+2 and 3x-11 form an arithmetic progression..



  d = -4x + 5

  -6x = -18 , x = 3,  and d = -7