5 gallons of water is added to 3 gallons of a 30 percent antifreeze solution. How many gallons of 90% antifreeze should be added to it to get 55 percent antifreeze?

the bottom of the spinner is not flat.

step-by-step explanation:

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

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.

sine

step-by-step explanation: