Which method can you use to prove these triangles congruent?

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

Vinay constructed this spinner based on the population of teachers at his school according to vinays model what is the probability that he will have a male history teacher two years in a row

The length of the line segment joining the midpoints of sides ab and bc of the parallelogram abcd is 10. find the length of diagnol ac