In the triangle, find x, y, u, v

Step-by-step explanation:

Each of the triangles is similar, so we have ...

  3/5 = (3+x)/20

  x = 20(3/5) -3

  x = 9

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  4/5 = (4+y)/20

  y = 20(4/5) -4

  y = 12

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  3/5 = (3 + x + u)/60

  u = 60(3/5) -3 -9

  u = 24

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  4/5 = (4 +y +v)/60

  v = 60(4/5) -4 -12

  v = 32

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.

you are uyytr tyy

step-by-step explanation: