Answers

2016-07-09T17:06:51+08:00
2016-07-09T18:26:25+08:00
A4 + 7d (common difference)= a11
10+7d=45             transpose 10 to the other side
7d=45-10
7d=35
DIVIDE BOTH SIDES BY 7
d=5
1 4 1