Posted by Riana on Tuesday, January 1, 2013 at 11:11pm.
the difference between T10 and T20 is 10d. So, 10d=710-34=676
d=67.6
T25=T20+5d = 710+338=1048
the answer is t25=79
and it sum of 20th term that is S20=710.
you cannot have the "sum of the 20th term".
If you mean the sum of the 1st 20 terms, then
T10 = a+9d=34
S20 = 10(2a+19d) = 710
so, a=7, d=3
T25 = 7+24*3 = 79
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