Find the number of cubic centimeters in the volume of the cylinder formed by rotating a square with side length 14 centimeters about its vertical line of symmetry. express your answer in terms of $\pi$.

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Solve 3x-18=2y and 5x-6y=6 by elimination show work

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?