You have a 4.9 percent chance of testing positive. Hope this helped!
This question is asking "Where does cosine equal

?"
Based on our unit circle values and the domain of the cos^{-1} function, we see that at 30 degrees, or

, cosine is equal to

.
She makes 5% on 5000 and 7.5% on the other 3000.
0.05 x 5000= 250
0.075 x 3000= 225
Add 250 and 225
She earns $475 in all.
Answer:
There are a 25% probability that Christine fails the course.
Step-by-step explanation:
We have these following probabilities:
A 50% probability that Christine finds a tutor.
With a tutor, she has a 10% probability of failling.
A 50% probability that Christine does not find a tutor.
Without a tutor, she has a 40% probability of failing.
Probability that she fails:
10% of 50%(fail with a tutor) plus 40% of 50%(fail without a tutor). So

There are a 25% probability that Christine fails the course.
First you would subtract the monthly fee from the total bill

Maria spend $12.35 on songs, to find out how many songs, you divide that by $.95

Maria bought 13 songs this month.