Recall that the slope is the "average rate of change" of any function.

The answer you already have selected in the image is correct. Even eyeballing it, you can see that the smaller shape fits into the larger shape 4 times.
Answer:
domain: (- infinity, infinity) range:( 0, infinity)
Step-by-step explanation:
Area of rectangle = 9x8=72ft^2
Base of triangle= 13-9=4ft
Area of triangle =4x8 =32ft^2
72+32=104ft^2
So your answer is 104ft^2
Hope this helps