Chapter P - P.3 - Functions and Their Graphs - Exercises - Page 27: 15

Domain: $[0,\infty)$ Range: $[0,\infty)$

Since the function has a square root x cannot be negative, therefore the domain will be all the real values of x greater then or equal to 0. When x is 0 g(0)=0. This is the smallest value for the range. All the other x values are positive extending the range to positive infinity.