Jenna has a bag of 4 marbles: 1 red, 1 blue, 1 green, and 1 purple. make a sample space for jenna picking two marbles at a time. how many outcomes are there?

Whats the name of the vertical axis

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?

15 liters is approximately how many gallons