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Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?