What is the missing number in the
sequence -10,-6, -2,_ 6, 10?

It would be a positive 2.

Step-by-step explanation:

This is because if you start with -10 and add 4, the number 2 would go in the blank. Also if you start at positive 10 you just subtract 4 and the number 2 would still go in the blank.

Hope this helps!

The hight and the base line been constant and the diagonal of a paralelogram being the line that shares it in two equal parts, it would be easy to guess that