Answer:
6
Step-by-step explanation:
To get the answer, we simply plug in -10 into x of the formula:
[tex]b(x)=|x+4|\\b(-10)=|-10+4|\\=|-6|\\=6[/tex]
Third answer choice is right, 6
*Note: the two bars, " | | " -- absolute value, makes anything inside it into positive
