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Fill in the missing terms of the arithmetic sequence.
-7, __, 1, 5, __, 13

1. -3, 9
2.-3, 10
3.-4, 9
4.-4, 10

Sagot :

1. -3, 9

The pattern is that you add 4 to the number before.

-7 + 4 = -3
-3 + 4 = 1
1 + 4 = 5

and so on...

Answer:

the missing terms are x, y

we have:

x + 7 = 4 => x = -3

13 - y = y - 5

<=> 2y = 18

<=> y = 9

so the missing terms are -3; 9