Tuesday

January 27, 2015

January 27, 2015

Posted by **Abisola** on Wednesday, August 7, 2013 at 4:12am.

- math -
**Steve**, Wednesday, August 7, 2013 at 4:57amS20 = 20/2 (T1+T20)

d = (T12-T9)/3

T1 = T9-8d

Now just plug and chug.

**Answer this Question**

**Related Questions**

math - d 9th term of an Ap is 52 while d 12th term is 70. find sum of it's 20th ...

math - the 9th term of an AP is 52 while the 12th term is 70.find the sum of its...

arithmetic progression - the 9th term of an AP is 52 while the 12th term is 70. ...

arithmetic - The 9th term of an A.p is 32 while the12th termis70.find the sum of...

Maths - 1) In the arithmetic progression, the 8th term is twice the 4th term and...

maths - The 4th term of an ap is 15 while the 7th term is 27, find the sum of ...

Math:A.P. - The 1st,3rd and 9th terms of an A.P are the three terms of a G.P.if ...

maths - Given that the first term of an A.P is 7 and its 10th term is twice its ...

math - Find the 265th term of an arithmetic sequence whose second term is 5/8 ...

math - the 10th term is 34 of arithmetic series and the sum of the 20th term is ...