Check the picture below.
the area of the triangle whose base is AC and height is BD, is the same area of the triangle whose base is AB and altitude is BC, namely

Answer:
A) Divide 20 by 2 and then add 8 to the result
Step-by-step explanation:

The height of the model is 6.1 inches.
If 1 inch represents 50 feet, to find the answer, divide 305/50.
the answer is 6.1 inches.
Hope this helps, and have a fantastic day.