I hate study island lol and are those supposed to be powers? Like 3 to the power of 8
Answer:
1/4
Step-by-step explanation:
Let's denote the probabilities as following:
Probability that a teenager has a sister:
P(A) = 12/28
Probability that a teenager has a brother:
P(B) = 7/28
Probability that a teenager has both a sister and a brother:
P(A⋂B) = 3/28
Probability that a selected teenager has a sister also has a brother, or in other words, he/she has a brother, given he/she had a sister:
P(B|A)
Let's apply the formula of conditional probability to work out P(B|A)
P(B|A) = P(A⋂B)/P(A) = (3/28)/(12/28) = (3*28)/(12*28) = 3/12 = 1/4
=> Option C is correct
Hope this helps!
A desk costs $44, but they boost the price 150%

They are selling it at $66 (selling price)
Since Michelle sold it at $66 and she earns 20% on the selling price as commission, then it is simply

That should be the commision amount michelle earns
Answer:
-1/9
Step-by-step explanation:
2.3+0.23 = 2.53
2.53+0.023 = 2.553