Answer:
Part a) The area of the tile is

Part b) The area of the tile is

Explanation:
Part a) What is the area of the tile in square feet?
we know that
The area of a square is equal to

where
b is the length side of the square
we have

substitute the value

Part b) Isamu put 4 of the tiles together to make a square. Write and solve an equation to find the area, in square feet, of the square
we have that
The new length side of the tile is

the new area is equal to
