In this particular arithmetic sequence, a6 = 36 and a17 = 113. what is the value of a23 a23=101 a23=155 a23=162 a23=167

Determine first the common difference (d) of the arithmetic sequence using the given terms,
                             d = (a17 - a6) / (17 - 6) 
                               d = (113 - 36) / 11 = 7
Using the 17th term, 113, we get the value of a23 by,
                             a23 = a17 + (23 - 17) x 7
                                    a23 = 113 + 42 = 155
Thus, the 23rd term is 155. 

  example you can find the perimeter by addig all of its respective sides as such: (12+x)+(12+x)+(7+y)+(7+y).  adding like terms will result in   2x+2y+38    if you chose  xy+7x+12y+84, you multiplied the two sides to find the area.  if you chose  x+y+19