Triangle ABC has vertices at A(3 , 7), B(5, 7), and C(3, 1). Which statement proves that triangle ABC is a right triangle?

A) AC = BC
B) AB ⊥ BC
C) AB ⊥ AC
D) AC ⊥ BC

option B

Step-by-step explanation:

look at my picture. I hope it explains it

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.