Question

help

Answer 1

@e.mccormick @Jhannybean

Answer 2

\[G \left( y \right)=\sqrt{y},G \left( F \left( x \right) \right)=\sqrt{F \left( x \right)}=\sqrt{x+4}\]
It is defined if
\[x+4\ge 0 or x \ge -4\]
Hence domain is all numbers greater than or equal to -4.