The radius of a circle is 9 1/4 mm. what is the circumference in terms of pi?

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

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Atotal of 766 tickets were sold for the school play. they were either adult tickets or student tickets. there were 66 more student tickets sold than adult tickets. how many adult tickets were sold?