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3 years ago

Insert 6 arthematic mean between 5 and -9

Mathematics

1 answer:

astraxan [27]3 years ago

5 0

Answer:

see explanation

Step-by-step explanation:

Consider 5 and - 9 to be terms in an arithmetic sequence and we require to find the 6 terms between them.

The n th term of an arithmetic sequence is

$a_{n}$ = a + (n - 1)d ← d is required

Here a = 5 and $a_{8}$ = - 9, hence

5 + 7d = - 9 ( subtract 5 from both terms )

7d = - 14 ( divide both sides by 7 )

d = - 2

---------------------------------------------------------

The terms in the sequence are

5, 5 - 2, 5 - 4, 5 - 6, 5 - 8, 5 - 10, 5 - 12, - 9 , that is

5, 3, 1, - 1, - 3, - 5, - 7, -9

With the 6 arithmetic means being

3, 1, - 1, - 3, - 5, - 7

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Insert 6 arthematic mean between 5 and -9​

Insert 6 arthematic mean between 5 and -9