Question

What are the domain and range of this function

Answer 1

$f(x)=\sqrt{x-7}+9\\\\\text{the domain:}\\x-7\geq0\to x\geq7\\\\\text{the range:}\\\sqrt{x-7}\geq0\ \text{therefore}\ \sqrt{x-7}+9\geq9\\\\y\geq9$

$Answer:\\domain:\ x\geq7\\range:\ y\geq9$