Find the Domain of the Composite Function F∘g $f ( x ) = 2 x + 6 ; \quad g ( x ) = \sqrt { x }$

Multiple Choice

Find the domain of the composite function f∘g.
- $f ( x ) = 2 x + 6 ; \quad g ( x ) = \sqrt { x }$

A) $[ 0 , \infty )$
B) $[ - 3 , \infty )$
C) $( - \infty , - 3 ]$ or $[ 0 , \infty )$
D) $( - \infty , \infty )$