Solve 3x−5 = 9.

x = −3
x = 2
x = 7
x = 8

Need on this geometry question. explain how you did it.

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

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33