In the given sequence, we have an arithmetic sequence which is given by the following formula:

Where an is the nth term of the sequence, a1 is the first term, n is the number of terms and d is the common difference.
We can find the common difference by applying the formula:

If we replace an=-22 and an-1=-30, we find:

The common difference is d=8.
The number that goes in the green box is the 6th term of the sequence. Then a1=-30, n=6, d=8. Replace these values into the formula and solve:

The answer is 10.