Sand pouring from a chute forms a conical pile whose height is always equal to the diameter. If the height increases at a constant rate of 5ft/min, at what rate is sand pouring from the chute when the pile is 10 ft high?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

If chord ab is congruent to chord cd, then what must be true about ef and eg?

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?