Lisa has 6 hours of studying to do. If she divides her study time into 1/2-hour sessions, how many study sessions will she need?

Can someone me with this problem . show your work .

Find the domain and range of the following function f(x) = 51x - 21+ 4

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?