7. Concrete can be purchased by the cubic yard. How much will it cost to pour a slab 15 feet by 15 feet by 2 inches for a patio if the concrete costs \( \$ 51.00 \) per cubic yard?

Step 1 ：Convert the dimensions of the slab to yards: \( 15\text{ ft} \times 15\text{ ft} \times \frac{2}{12}\text{ ft} = 15\text{ yd} \times 15\text{ yd} \times \frac{1}{6}\text{ yd} \)

Step 2 ：Calculate the volume of the slab in cubic yards: \( 15\text{ yd} \times 15\text{ yd} \times \frac{1}{6}\text{ yd} = 37.5\text{ yd}^3 \)

Step 3 ：Calculate the cost of the concrete: \( 37.5\text{ yd}^3 \times \$51.00 = \$1912.50 \)