Please help me i am struggling

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

At the beginning of a call to the cable company, a message tells customers, "after you finish talking to our customer service representative, you will be asked to take a five-question survey about the level of service you recieved. it would be appreciated if you could stay on the line to answer the survey questions." what type of sampling is the cable company using?

(25 ! ) what does it mean for an equation to have no solution or infinitely many solutions?