Help or else i will call Ghost busters!

Use set buikder notation to represent the following set: {, -2, -1, 0}

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.