Use a property of equality to solve the equation
- 2a/5 = 13/15

a = -13/6

Step-by-step explanation:

Multiply both sides by the same number (15).  This clears out the fractions:

     -2a             13

15 = 15

        5               15

Then we have -2a(3) = 13, or

                          -6a    = 13, or

                              a = -13/6

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: when u removing the parentheses and combined them that would be : x+3y-x-y=2y