Tuesday

September 2, 2014

September 2, 2014

Posted by **Anonymous** on Friday, October 14, 2011 at 8:23am.

- math -
**Reiny**, Friday, October 14, 2011 at 8:33ama+8d=52

a+11d=70

subtract ....

3d = 18

d=6

sub into the 1st equation to find a, then

sum(20) = (2//2)[2a + 19d ]

**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 - pls help me out in dis ? dat says The 9th term of an Ap is 52 while d ...

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

Maths - The 3rd term of an AP is 10 more than the first term while the fifth ...

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

Precalc - Find a formula for the nth term if... a)the 8th term is 8 and the 20th...

arithmetic - the sum of the 3rd and the 4th term is 44 and the sum of the 10th ...