Ask a New Question

The 4th term of a A.P is 6. If the sum of 8th and 9th is _72, find the common difference

1 answer

we have
a+3d = 6
(a+7d + a+8d) = -72
That gives us
a = 34
d = -28/3

Ask a New Question or answer this question.

Similar Questions

The sixth term of GP is 16 and the third term is 2.Find the first term and common ratio. 6th term =16 3rd term=2 So ar^5=16 and
1. 5 answers
Find a formula for the nth term if...a)the 8th term is 8 and the 20th term is 44 b) the 8th term is 4 and the 18th term is -96
1. 2 answers
The sixth term of an A.P. is 5 times the first term and the eleventh term exceeds twice the fifth term by 3 . Find the 8th term
1. 5 answers
The fifth term of an arithmetic sequence is 23 and the 12th term is 72. And they say first question 1.determine the first three
1. 3 answers

more similar questions