Compare features of functions

Problem

• start color blue, f, end color blue is a function defined on all real numbers. Its formula is given below.
• start color pink, g, end color pink is a function defined on all integers between minus, 3 and 3 (inclusive). Its values are given in the table below.
• start color green, h, end color green is a function defined on all real numbers. Its graph is given below.
Each function has a minimum value, which is its least possible output.
The minimum value of which function is the lowest ?