Rex has a square deck that is 9 feet long on each side. He decides to add triangular benches in each corner as is shown in the diagram.

Someone help me plsss! Look at the pic attached.

40.5 ft2

Step-by-step explanation: First find the area of the square. Then do 3x3 because the is the triangle.  Then divide 3x3 by 2 giving us 4.5 then mutiply by 9. Subtract 40.5 by 81. And thats you answer

If that is wrong try 45ft2

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.

the second option

step-by-step explanation: