Question 755505
Domain for {{{f(x)= (sqrt(x-5))/3}}}  means, the set of values that x can be.  If you are only dealing in real numbers, then the restriction is that x-5>=0, meaning x>=5.  The domain is then the set of all real numbers greater than or equal to 5.  As done in interval notation, the domain is [+5, infin).