Kevin drove his car to a concert. his car can go 400 miles with a full tank of gas. he used 30% of the full tank of gas to get to the concert while traveling 60 miles per hour

It takes him 2 Hours to reach the concert.

Step-by-step explanation:

Given the car can travel 400 miles with a full tank of gas.

It used 30% of the full tank of the gas to get to the concert. Which means it travelled =120 miles.

Also given that kevin travels at 60 miles per hour

That means it takes him one hour to travel 60 miles.

Now to travel 120 miles it takes him 2hours .

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.