If each brick weighs 2.81 kilograms, then 15 bricks will weigh how much in kilograms?

They will weigh 42.15 kilograms altogether.

Step-by-step explanation:

You simply need to multiply 2.81 and 15 together to get 42.15. You would multiply 15 by 2.81 because each brick is 2.81 kilograms, the key word each gives you the hint to multiply. Thus, the bricks weigh 42.15 kilograms altogether.

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.