4. Which of the following sets of ordered pairs represents a FUNCTION?* 1 point (11, -7)
(14, 7)
(14, -9)
(15, -7)
(17, 7)
(15, -13)
(13, 1)
A
(10, -6)
(16, 18)
(16, 7)
(-3, 14)
(2, 16)
(16, 20)
(20, 10)
Oo

Find the vertex of the function given below y=x^2-6x+1

Which expression gives the area of the triangle shown below

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?