Answers

2016-07-17T20:08:25+08:00
D=an-a1/n-1
d=146-42/14-1
d=104/13
d=8

ayan na yung answer :)
0
2016-07-17T20:14:34+08:00
146=42+(14-1)d
146=42+13d
146-42
104=13d divide both side by 13
d=8
0
but this is the formula Sn=n over 2 (2a1 (4-1)d)
arithmetic sequence pala