Gina uses the function LaTeX: k\left(h\right)\:=\:\sqrt{4h\:-\:12}k ( h ) = 4 h − 12 to model the height of a kite based on the amount of string released when the kite is flown. The variable h represents the height of the kite in feet and k(h) represents the amount of string released in feet. How how high was the kite when Gina released 20 feet of string?