13.2, you need to buy 14.
The panels will cover an area of 352.44 square feet.
58 1/2
100
100
37.33 cubic feet
124.7 sheets
Another 53.75 square feet of tile would be needed.
4
1485
1 square yard = 9 square feet so 195 sq feet = 195/9 sq yards = 21.66... sq yards.
540 feet2
You would need 8.