Fill in the blanks -7 / 9 + =2

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

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Apool measures 100 meters by 100 meters a toddler inside the pool and trows a ball 60 centimeters from one edge of the pool.how far is the ball from the opposite edge of the pool