Write the equation of the locus if all points in the coordinate plame 10 units from (-6,9)

The locus is  (x + 6)^2 + (y - 9)^2 = 100

Step-by-step explanation:

This is a circle with center (-6,9) and radius 10 units.

The general  equation of a circle with center (a, b) and radius r is

(x - a)^2 + (y - b)^2 = r^2  so we insert the given values into this general equation to get the locus.

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.