Concrete can be purchased by the cubic yard. How much will it cost to pour a slab 11 feet by 3 inches for a patio if the concrete costs $63.00 per cubic yard?

First, we need to calculate the volume of concrete needed for the patio slab.

11 feet in length
3 inches in width = 0.25 feet (since 1 foot = 12 inches)
0.25 feet in depth

Volume = length x width x depth
Volume = 11 feet x 0.25 feet x 0.25 feet
Volume = 0.6875 cubic feet

Next, we need to convert the volume to cubic yards because the concrete is sold by the cubic yard. There are 27 cubic feet in 1 cubic yard.

0.6875 cubic feet รท 27 = 0.025463 cubic yards

Therefore, we will need approximately 0.0255 cubic yards of concrete for the patio slab.

Now, we need to calculate the cost of the concrete. If the price is $63.00 per cubic yard, then:

Cost = volume x price per cubic yard
Cost = 0.0255 cubic yards x $63.00
Cost = $1.61

So, it will cost approximately $1.61 to pour a slab 11 feet by 3 inches for a patio.