Question 37829
a1=23
a8=44


right then: first term of a AS or AP is a.
and 8th term is a+7d


so we have a=23 and a+7d=44.


Now, subtract them:
a+7d - a = 44-23
7d = 21
so d = 3


and hence 5th term, written as a+4d, is:
a+4d 
23 + 4(3)
23 + 12
35


jon.