Select all the systems of equations that have exactly one solution. y = 3x + 1 y = -3x + 7 y = 3x + 1, , y = -3x + 7, y = 3x + 1 y = x + 1 y = 3x + 1, , y = x + 1, y = 3x + 1 y = 3x + 7 y = 3x + 1, , y = 3x + 7, x + y = 10 2x + 2y = 20 x + y = 10 , , 2x + 2y = 20 , x + y = 10 x + y = 12

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min