I don't understand by what they subtract...

I'm learning Arithmetic Sequences and here's the sequence:
-6, -4 2/3, -3 1/3, -2

By what do they add here?

nevermind, I found out =]

To determine what is being added in an arithmetic sequence, you need to observe the pattern between consecutive terms. In this case, each term is obtained by adding a constant value to the previous term.

Let's look at the given sequence: -6, -4 2/3, -3 1/3, -2.

To find the common difference, subtract each term from its preceding term.

(-4 2/3) - (-6) = -4 2/3 + 6 = 1 1/3
(-3 1/3) - (-4 2/3) = -3 1/3 + 4 2/3 = 1
(-2) - (-3 1/3) = -2 + 3 1/3 = 1 1/3

From the calculations above, we can see that each pair of consecutive terms has a constant difference of 1 1/3.

Therefore, in this arithmetic sequence, they add 1 1/3 to get the next term.