The function f(x)\displaystyle {f{{\left({x}\right)}}} has a domain of all real numbers, is periodic and has a period of p=13\displaystyle {p}={13}. The graph of one complete period is shown below.
Find the following values:
f(9)=\displaystyle {f{{\left({9}\right)}}}=  
f(19)=\displaystyle {f{{\left({19}\right)}}}=  
f(185)=\displaystyle {f{{\left({185}\right)}}}=