Area of a rectangle is (length) x (width) . (You're supposed to know this.)
Area of Mr. Mohr's patio = (13.5) x (43) = 580.5 square feet.
12 inches = 1 foot
Area of each tile = (1 foot) x (1 foot) = 1 square foot.
So Mr. Mohr needs at least 581 tiles to cover the whole patio.
That's if he's really good at cutting tiles into smaller pieces, because
he can't use all whole tiles to cover the 13.5 feet dimension.
In any case, the patio is 580.5 square feet, and each tile is 1 square foot,
so he needs to buy a minimum of 581 tiles.
