120+40x=180+20x solve for x (show your work please)

x=3

Step-by-step explanation:

40x + 120 = 20x + 180

(40x - 20) + 120 = (20x- 20) + 180

= 20x + 120 = 180

20x + (120-120) = 180 - 120

20x = 60

divide 20 to both sides of 20 and 60 so you will get x=3

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.

step-by-step explanation:

compare