Help me out here please

12) y=25x

13) 14 gallons

Step-by-step explanation:

m= (y2-y1)/(x2-x1)

m= (75-50)/(3-2)

m=25/1=25

y-y1=m(x-x1)

y-75=25(x-3)

y-75=25x-75

y=25x

350=25x

x=350/25

x=14

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.