Answer:

And if we want to find
we can use this formula from the definition of independent events :

And the best option would be:

Step-by-step explanation:
For this case we have the following events A and B and we also have the probabilities for each one given:

And if we want to find
we can use this formula from the definition of independent events :

And the best option would be:

Im not sure if this is right but:
1. b
2. c
3. b
4. a
5. c
Really dude I don't even no that but maybe someone else
Answer: the answer is -4 I think