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Posted by **Riana** on Tuesday, January 1, 2013 at 11:11pm.

- math -
**Steve**, Tuesday, January 1, 2013 at 11:15pmthe difference between T10 and T20 is 10d. So, 10d=710-34=676

d=67.6

T25=T20+5d = 710+338=1048

- math -
**Riana**, Tuesday, January 1, 2013 at 11:17pmthe answer is t25=79

and it sum of 20th term that is S20=710.

- math -
**Steve**, Wednesday, January 2, 2013 at 5:07amyou 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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