Given:
A page of the scrapbook is a square with a length of 11 in
Each page holds three pictures that each have an area of 15in²
To find the remaining area, we will find the area of the page and the total area of the pictures, then subtract the area of the pictures from the area of the page
The area of the page = 11 x 11 = 121 in²
Total area of the pictures = 3 x 15 = 45 in²
So, the remaining area = 121 - 45 = 76 in²