5. A tree is broken at a height of 5 m from the ground and its top touches the ground at a distance of
12 m from the base of the tree. Find the original
height of the tree.

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?