If mary drove 525 miles in 7 hours at an average speed of 75 miles per hour, how fast would her average speed need to be to make the trip in 5 hours (a little speed

525/5 = 105 miles per hour for the speed demon.

Well it was quite simple to answer this question. As we knew the total distance that the speed demon had to cover in a specific amount of time that is obviously 5 hours we can simply divide the total distance by the time we had to travel.

Other wise obviously we could have calculated the average speeds separately and could have done it in a different manner.

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.