Lizzie's drum practice how many minutes of practice does one picture represent

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

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0