Which two sets of events are most likely independent?

A. Event A: A student has brown eyes.
Event B. The student is a girl.

B. Event A: A student does all her homework for Unit 5.
Event B. The student passes the Unit 5 test.

C. Event A: A man likes iced tea.
Event B. The man sings in a choir.

D. Event A: A student practices free throws regularly.
Event B. The student makes the basketball team.

Here's my reasoning:

Someone's eye color does not have any bearing on their gender or vice versa, so the two events are not linked together. They are independent. That's why I think choice A is the answer.

Something like doing homework is strongly linked to doing well on a test. The more homework practice you get, the more likely your grade will be better. We can rule out choice B since the two events are dependent.

Choice C is a bit tricky, but I would argue that tea (whether hot or cold) helps sooth the throat after a long day of singing. It might help reach those high notes maybe. So you could say the events are dependent. I would change "likes" to "drinks" because the person may not like the drink, but still rely on it to get the job done. We can rule out choice C.

Choice D is dependent since someone who practices free throws is likely to make the team. This is assuming the coach doesn't just randomly select people from a list. We can rule out choice D.

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)