-6 answer to -4+(-2)
3 answer to 7+(-4)
Answer:

Step-by-step explanation:
The sum of the first 10 terms of an arithmetic sequence is:


the sum of the second 10 terms is: a₁₁ + a₁₂+...+ a₂₀
And the sum of the first 20 terms of an arithmetic sequence is:

so the sum of the second 10 terms is:
Therefore we have:

and:

Answer:
B 1 1/7
Step-by-step explanation:
- 9 2/7 - ( -10 3/7)
We know subtracting a negative is like adding
- 9 2/7 +10 3/7
10 3/7 - 9 2/7
Putting this vertical
10 3/7
-9 2/7
-----------------
1 1/7
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