Answer
The interval notations changes from
$$(-\infty, 6]\cap(2,10)$$
to
$$(-\infty, 6]$$
Work Step by Step
In the interval notation we noticed bracket an parenthesis
Bracket means close circle
Parenthesis means open circle
$$(-\infty, 6] \cap (2, 10)$$ the symbol $\cap$ means all the common elements between these interval notations.
1. The commomn elemnts are (-\infty, 0,1,2,3,4,5,6]
2. The line will go from 6 (close circle•) to negative infinitive.
