Pls help and explain!! I will give brainliest!

Answer:
252 in²
Step-by-step explanation:
The figure can be considered as a rectangle with the rectangle on the right to be added on and the rectangle on the left to be subtracted.
Area of rectangle with length 12 and width 15 + 6 = 21 is
A = length × width = 12 × 21 = 252 in²
Since the areas of the 2 rectangles to be added / subtracted are equal
both 6 × 3 = 18 in² , then they can be ignored
Then area of figure = 252 in²