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April 21, 2014

April 21, 2014

Posted by **Annie** on Tuesday, January 3, 2012 at 6:24pm.

- math -
**Reiny**, Tuesday, January 3, 2012 at 7:03pmI will assume that you know the formulas for term(n) and sum(n) of an AS

10 term is 34 ---> a+9d = 34

sum of 20 terms is 710 ---> (20/2)[2a + 19d] = 710

2a + 19d = 71

double the first equation, then subract

2a + 18d = 68

d = 3

back into 1st ---> a + 27 = 34

a = 7

term(25) = a+24d = 7 + 72 = 79

- math -
**Anonymous**, Thursday, January 5, 2012 at 12:33amThanks :) so much

- math -
**Anonymous**, Saturday, January 7, 2012 at 12:47pmuidont

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