Only answer question 4 please I will mark brainliest and give 10 points

a. €50+€x

b. €70+€x

Step-by-step explanation:

a. if the jumper is x and a jacket is 50 more than to find the price of the jacket you would add 50 plus x

b. if the coat is 20 more than a jacket and we already know that the jacket is €50+€x add 20 more and you get €70+€x

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.

b

step-by-step explanation: