Answer:
Step-by-step explanation:
Note that the squaring function and the square root function are inverses of one another.  If we make a list of perfect squares, we get {1, 4, 9, 16, 25, ...}.  Then the square roots of these numbers are {1, 2, 3, 4, 5, ... }.
Continue making a table of values to plot.  The first row has x=0, y=0; this reflects that the sqrt of 0 is 0.
Fill the first (x-) column with perfect squares and the second (y-) column with the square roots of these perfect squares:
x   y
0   0
1    1
4    2
9    3
and so on.
Now plot the following on the graph:  (1,1), (4,2), (9,3), ....  
Starting at (0,0) and moving to the right (indicating increases in x), plot these  points.  (You'll soon run out of room.)  Draw a smooth curve from (0,0) to connect these points.  The result is a graph of the square root function.
The domain of this function is "the set of all real numbers ≥0" and the range is the same:  "the set of all real numbers ≥0"