A sculpture is made of solid steel in the shape of a cone. The sculpture is 60 inches tall, and its base has a radius of 11 inches. If steel costs $0.45 per cubic inch, how much did the steel for the sculpture cost?
Use 3.14 for pi, and do not round your answer.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

The cross-sectional areas of a right triangular prism and a right cylinder are congruent. the right triangular prism has a height of 6 units, and the right cylinder has a height of 6 units. which conclusion can be made from the given information? the volume of the triangular prism is half the volume of the cylinder. the volume of the triangular prism is twice the volume of the cylinder. the volume of the triangular prism is equal to the volume of the cylinder. the volume of the triangular prism is not equal to the volume of the cylinder.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.