Need help with number 4

Perimeter=18; Area= 18

Step-by-step explanation:

For perimeter, the vertical sides are 3 and the Horizontal sides are 6. So 6+6+3+3= 18

For area, the vertical side is 3 and the Horizontal side is 6, this 6*3=18

x≥0

Step-by-step explanation:

The domain of the function f (x) is all the values ​​of x for which the function is defined. In a graph, this can be seen as all the values ​​that the function takes with respect to the x-axis. This function graph only has positive values and the zero, this means x takes zero and the values bigger than zero. So x≥0.