1) a scuba diver dives beneath the surface of the water 34 feet. he swims up 13 feet closer to the surface, then swims back down another 5 feet. what is his net feet below the surface?

2) a plumber charges $50 each visit plus $15 per hour. how many hours did the plumber work if he earned s total of $220?

me with these two questions

10 * 563.67 = 5636.7

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.