Allen is running a marathon. He would like to finish the race in under 5.5 hours. He has already run 3 hours. The inequality 3 + t less-than 5.5 represents the situation. Which number line shows how much longer Allen can run and still meet his goal?
A number line going from 0 to 3. An open circle is at 2.5. Everything to the left of the circle is shaded.
A number line going from 0 to 3. A closed circle is at 2.5. Everything to the left of the circle is shaded.
A number line going from 0 to 3. An open circle is at 2.5. Everything to the right of the circle is shaded.
A number line going from 0 to 3. A closed circle is at 2.5. Everything to the right of the circle is shaded.

Step-by-step explanation:

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Also I pretty much just summed this up from the answer above. So give them credit too! Peace out✌

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.