What is 8 1 over 4 - 4 3 over 4?

3 2/4 is your answer.

Step-by-step explanation:

8 1/4 - 4 3/4

Subtract. Note that one whole number = 4/4 (1 = 4/4)

Now, change the first fraction by breaking down one whole number into fraction form.

8 1/4 = 7 4/4 + 1/4 = 7 5/4

Subtract.

7 5/4 - 4 3/4 = 3 2/4

3 2/4 is your answer.

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x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

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.