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if three arithmetic means are inserted between -11 and -31 find the first of these arithmetic means

Sagot :

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Answer:

Step-by-step explanation:

-9 is the first arithmetic means

Step-by-step explanation:

FORMULA:

Last term - first term

d = ————————————

No. Of terms - 1

9 - (-15)

d = ————

5 - 1. There are five number of terms because there will be 3 arithmetic means added to the two given numbers.

9 + 15. 24

d = ———— = ———— = 6

5-1. 4

To find next term add the difference to the first term.

6 + (-15) = 6-15 = -9 first arithmetic mean

6 + (-9) = 6-9. = -3

6 + (-3). = 6-3 = 3

6 + (3) = 6+3 = 9