Posted by zandile on Thursday, March 7, 2013 at 2:43pm.
The sum of the first 10 terms of an arithmetic series is 145 and the sum of its fourth and ninth term is five times the third the..determine the first term and constant difference

math  Steve, Thursday, March 7, 2013 at 3:30pm
10/2(2a+9d) = 145
a+3d + a+8d = 5(a+2d)
a=1
d=3