Answer:
The total area covered by Liza and Abby is 44.5 ft².
Step-by-step explanation:
Area of a rectangle is

The area of pink blanket is

Therefore the area of pink blanket is 28.5 ft².
The area of blue blanket is

Therefore the area of blue blanket is 24 ft².
The area of a triangle is

The common area is

Therefore the common area of both blanket is 8 ft².
The total area covered by Liza and Abby is

Therefore the total area covered by Liza and Abby is 44.5 ft².