Answer: To find the total area of the grass that Yuri's dad needs to fertilize, we need to calculate the area of the back yard and the area of the front yard, and then add them together.
Area of the back yard:
The back yard measures 55 feet by 30 feet, so the area is:
55 feet x 30 feet = 1650 square feet
Area of the front yard:
The front yard is a square with a length of 42 feet on each side, so the area is:
42 feet x 42 feet = 1764 square feet
Total area:
To find the total area, we add the area of the back yard and the area of the front yard:
1650 square feet + 1764 square feet = 3414 square feet
Therefore, Yuri's dad needs to fertilize a total area of 3414 square feet.
Explanation: