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3 years ago

9

An arithmetic sequence is defined by its 1st term a1 = 7 and the sum of the first 10 terms s10 = 25. Find the difference d of th

e sequence.

1 answer:

VARVARA [1.3K]3 years ago

3 0

Step-by-step explanation:

difference is 1.8

hope it is correct

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Darya [45]

Answer: $d=-1/2$

<u>Move all terms to the left</u>

<u></u> $d*24-(-12)=0$ <u></u>

<u></u>

<u>Add all the numbers together, and all the variables</u>

<u></u> $d*24+12=0$ <u></u>

<u></u>

<u>Multiply elements</u>

<u></u> $24d+12=0$ <u></u>

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<u>Move all terms containing d to the left, all other terms to the right</u>

<u></u> $24d=-12\\-12/24\\d=-1/2$ <u></u>

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