Goran, a college freshman, is deciding on classes for his first term. He can choose to take some or all of the seven classes from the list below. He must take at least one of them.
Astronomy, Biology, Chemistry, Dance, Economics, Geography, History
In how many different ways can Goran choose the classes to take? (The order of the classes chosen doesn't matter.)

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

If value of cos330° is √3/2 then find tan165°.

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?