Which of the following relations is a function? I. {(-2, 3), (2, -3), (4, -2), (-3,4)}
II. {(-2, 2), (4,3), (-3, 3), (-2, 4);
III. {(2, -3), (3,-4), (3, -3), (-4,4)}
IV. {(-4, 3), (-3, -3), (2, -3), (-2, -4)}
1. III, and IV only
I and IV only
II and III only
O I only

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day

Ahovercraft takes off from a platform. its height (in meters), xx seconds after takeoff, is modeled by: h(x)=-2x^2+20x+48h(x)=−2x 2 +20x+48 what is the maximum height that the hovercraft will reach?

70 points ! pls 2. given the following two sets of data what is the union of the two sets and what is the intersection of the two sets. set a = {1, 2, 3, 4, 5, 6, 7, 8, 9} set b = {2, 4, 6, 8, 10, 12, 14} 3. given a regular deck of cards. describe a way of pulling cards that would create a dependent event and then one that would create an independent event. 4. what is the probability of drawing a red card and then drawing a spade without replacing the card that was drawn first?