math
posted by Riana .
the 10th term is 34 of arithmetic series and the sum of the 20th term is 710.what is the 25th term?

math 
Steve
the difference between T10 and T20 is 10d. So, 10d=71034=676
d=67.6
T25=T20+5d = 710+338=1048 
math 
Riana
the answer is t25=79
and it sum of 20th term that is S20=710. 
math 
Steve
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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