Friday

May 6, 2016
Posted by **Anonymous** on Friday, November 4, 2011 at 6:17am.

- arithmetic -
**Reiny**, Friday, November 4, 2011 at 8:59amterm(3) = a+2d

term(8) = a+7d

a+7d = 5(a+2d)

a+7d = 5a + 10d

-4a = 3d

a = -3d/4

in the same way

a+6d = (a+3d) + 9

3d = 9

d = 3

then a = -9/4

first 5 terms are: -9/4, 3/4, 15/4, 27/4, 39/4

or -2.25, .75 , 3.75, 6.75, 9.75

check:

term(8) = 18.75

term(3) = 3.75

what is 5(3.75) ?

term(7) = 15.75

term(4) = 6.75 , do they differ by 9 ? ,YES - arithmetic -
**Magaret Ekerendu**, Tuesday, May 7, 2013 at 1:20pmNo