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Step-by-step explanation:

tanФ = opp / adj.

where Ф = 74,  opp = 16,  adj. = x

find: x

just plugin the values into the formula

tanФ = opp / adj.

tan(74) = 16/ x

x =    16          

        tan(74)

x = 4.59

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.

a: 1/6, j: 1/4

step-by-step explanation: you are welcome