## Precalculus: Mathematics for Calculus, 7th Edition

The interval notations changes from $$(-\infty, 6]\cap(2,10)$$ to $$(-\infty, 6]$$
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.