456 in².
Explanation:
First find the area of the rectangle. To do so, multiply 22in by 18in to get 396in².
Next find the area of the triangle using the formula base × height × (½) = area. The height is 12in and the base is 10in, which can be found by doing 22 inches on the bottom minus the 6 inches on both sides. 12 × 10 is 120, divided by 2 is 60in².
Add 396in² and 60in² to get 456in².
Hope this helps!
