2questions for 15 pionts

1. which best describes the polygon whose vertices in the coordinate plane are (-5,,-3)(1,-3)(1,0)

a. only equilateral
b. only equiangular
c. regular
d. congruent

2. which best describes the polygon whose vertices in the coordinate plane are (-3,0) (3,0) (0,-3)

a. only equilateral
b. only equiangular
c. regular
d. none of the above

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