Find the tenth term of the sequence.

3, 2, - 1, - 6, - 13, ...

The tenth term is?

-78

Step-by-step explanation:

Odd differences:

3 - 1 = 2

2 - 3 = - 1

-1 - 5 = - 6

-6 - 7 = - 13

-13 - 9 = - 22

-22 - 11 = - 33

-33 - 13 = - 46

-46 - 15 = - 61

-61 - 17 = - 78

-78

Step-by-step explanation:

We subtract 1, then 3, then 5, then 7

Then subtract 9,11,13,15,17

-21 - 11 = - 33

-33 - 13 = - 46

-46 - 15 = - 61

-61 - 17 = - 78

3, 2, - 1, - 6, - 13, - 22, - 33, - 46, - 61, - 78