A, B and C form a triangle where BAC= 90°, AB=13.7mm and CA= 8.4, find the length of BC

Step-by-step explanation:

First you have to realize that you are told that A is the right angle. The middle letter of any angle is the vertex.

BA = 13.7

CA = 8.4

What is missing is the hypotenuse (which does not contain the letter A).

BC^2 = AB^2 + AC^2

BC^2 = 13.7^2 + 8.4^2

BC^2 = 187.69 + 70.56

BC^2 = 258.25

BC = √258.25

BC = 16.07

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.

b.-4 units

all you   do is count how many times you move