Hi! can you tell me the answer and explain how to do this (in your own words)? the best answer get's brainiest!

find the area:

Step-by-step explanation:

1. Find the area of rectangle.

Rectangle:

Width = 12 ft

Length = 5 + 10 = 15 ft

2. Find the area of two white triangles.

a) Right triangle with legs of 12 ft and 10 ft.

b) Right triangle with legs of 5 ft and 12 - 3 = 9 ft.

3. Find the area of shaded region:

the function makes a strait line horizontally with no x intercept but a y intercept at 9.