Identify Intervals on Which the Function Is Increasing, Decreasing, or Constant

Multiple Choice

Identify intervals on which the function is increasing, decreasing, or constant.
- $$h ( x ) = | x + 4 | + | x - 8 | - 9$$

A) Increasing: $( 4 , \infty )$ ; decreasing: $( - \infty , 8 )$ ; constant: $( 4,8 )$
B) Increasing: $( 8 , \infty )$ ; decreasing: $( - \infty , - 4 )$ ; constant: $( - 4,8 )$
C) Increasing: $( 9 , \infty )$ ; decreasing: $( - \infty , 4 )$ ; constant: $( 4,9 )$
D) Increasing: $( - \infty , - 4 )$ ; decreasing: $( 8 , \infty )$ ; constant: $( - 4,8 )$