Julie's favorite number is 4. She invents four different rules that fix the number four. This means that when the number 4 is the input, the number 4 is also the output. Show that each rule fixes four. Change the rules so that a new rule fixes 3. a. x/4 + 3
b. -4(x - 4) +4
c. 4^(x-3)
d. x^2